Television licence fee sales fell by over €2.7 million during the month of July.
Figures provided by the Department of Media show a continued decline in licence fee sales in the final week of the month with 3,490 fewer licences sold.
Throughout the four weeks of July, 17,297 fewer licences, which cost €160 each, were sold.
Separately, Fine Gael TD Alan Dillon, who is also a member of the Oireachtas Committee on Media and Dáil Public Accounts Committee, has called on RTÉ to publish a number of reports that were commissioned following the recent payments controversy.
The outstanding documents, which he said should be made available, are the Grant Thornton report into payments to Ryan Tubridy from 2017 to 2019, an internal RTÉ review into Tubridy payments 2017 to 2019, a report into Toy Show The Musical and a report into the voluntary exit schemes in 2017 and 2021.
In a statement, Mr Dillon said: "TV licence revenue is collapsing and 1,800 people are employed at RTÉ.
"At the same time, we are left awaiting numerous reports which we have been promised for weeks at this stage."
He also called on the organisation to have a register of interests for all workers established and published by the end of September.
In a statement issued by RTÉ, Director General Kevin Bakhurst said: "I am very grateful to the many people who have continued to buy a TV licence during this period.
"I hope that recent coverage has reminded audiences of the value they receive from RTÉ day to day.
"As well as news coverage of major national events, the recent RTÉ Investigates programme on Sex for Rent was hugely important public service broadcasting.
"The GAA All-Ireland finals were watched by millions. This, and the compelling coverage of Ireland's Women's World Cup team and the other tournament games, were all free-to air.
"I'd like to take this opportunity to reiterate to audiences that we are working hard to rebuild trust in this organisation and RTÉ staff and programme-makers are working hard every day to provide exciting, creative and valuable programming and content - paid for by your licence fee."
A spokesperson for the RTÉ Board has confirmed that it has not received a copy of the Grant Thornton Report into payments to Mr Tubridy from 2017 to 2019.
The review is still ongoing and no drafts or briefings have been given to board members either.
A subcommittee of the RTÉ Board, the Audit & Risk Committee (ARC), commissioned the Grant Thornton review.
When completed, it will be furnished to the ARC and must also be presented to the wider board and Minister for Media Catherine Martin.
Speaking on RTÉ's News at One, Seamus Dooley, Irish Secretary of the National Union of Journalists said that while the drop in licences was "clearly worrying" it was part of a trend.
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"Ireland has one of the highest evasion rates in Europe at 15% and then there is another 15% who are deemed not to have devices or sets. So, while it is significant and deeply worrying, and particularly worrying for those working in RTÉ, I think it is part of a wider trend as well."
Mr Dooley said that it presents major challenges for RTÉ and it should also present challenges for the Government "because the wider trend is a consequence of political failure to deal with the issue of collection".
"And I do not think you can talk about this drop without discussing that whole issue of funding, the two are related."
With regards to what this drop means for RTÉ, Mr Dooley said it raises questions about the ability to deliver the public service that RTÉ does so well. He echoed the call to the public to recognise that recent events at the broadcaster are being addressed.
He said: "It is not just about presenter pay. There are huge failings at corporate level in RTÉ. There are two Government bodies engaged in that review and I would hope that the public will stick with RTÉ and stick with RTÉ journalists in particular.
"I acknowledge that there are trust issues here and trust once broken is very hard to secure. I also think Government has to look at seriously, some form of measures to ensure that RTÉ is able to continue providing the public service that politicians want."
Mr Dooley said that there is an onus on politicians who have not dealt properly with the issue of funding to step up to the plate on this issue now.
"I absolutely would lead the criticism in relation to corporate governance failure in RTÉ, but there is also a political challenge here. And I can’t emphasis the importance of ensuring that services are maintained," he said.
Mr Dooley agreed that several reports that were commissioned following the recent payments controversy need to be published, but said now should be a time for reflection on how RTÉ continues to do the job it does and make sure that the investigations ordered by the Government are carried out.
"By all means publish the report, but actually a period in which we look at what we want from our public service broadcaster and how we are going to enable that objective to be achieved is what is really needed at this stage."
