Fastway couriers and employees have said they are facing a bleak Christmas and have been left in limbo after the company went into receivership last week.
Franchisees and workers are holding a protest outside the company's depot in Greenogue, Co Dublin.
Nuvion Group includes Parcel Connect, Fastway Couriers Ireland and Nügo.
It is understood hundreds of additional jobs could be affected among subcontractors, franchisees and solo operators across the delivery network.
Watch: Fastway couriers and employees hold protest outside company depot
The couriers, who are franchisees, said they had to buy their routes from the company and are losing on the investment they made.
Employees and couriers said there are at least 1,000 people who were working for the company either directly or through franchises when it went into receivership last week.
They have also said employees and couriers are being left in limbo and without wages from October until the New Year.
Workers have been told they are still working for Fastway for 30 days from the day the receivership was announced, but will not get paid until the New Year and cannot claim social welfare benefits until the 30 days period is past.
If they seek to claim unemployment benefits or start new employment during that period they must resign from the company and would lose any redundancy entitlements.
Kim Wilson, who has worked for Fastway for 20 years, said employees might have to wait until February before they receive redundancy payments.
"We can claim back what we're owed, and wages from the Government, but it'll be capped at €600."
Franchisee couriers have not been paid for the last four weeks' work and some have drivers working for them who they must pay along with other expenses, such as fuel.
They believe there is little chance of recouping their losses but will try to claim back what they can as creditors.
Courier Ger Blake said "a lot of" Fastway franchisees have "four or five lads" working for them.
"They paid them by the week, as you normally would be paid. So they are doubly hit, anyone that has anyone working, especially around the countryside," he said.
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ISME, which represents some of the retailers affected by the Fastway closure says its members have refunded customers for items not delivered by the courier company which went into receivership last week but have been unable to recover the goods.
The Irish Small & Medium Enterprise group says the items are not the property of Fastway and should not be held in the company's depots. Part of the problem is that retailers are finding it difficult to get other courier companies to move the goods as they are operating at full capacity and are too busy to accept contracts to pick up and recover the undelivered items.
ISME says time is running out for companies to recover the goods for sale before the Christmas peak period and many fear they will not be able to recover their costs before next year.
