CITY Council chiefs are still refusing to publish crucial documents which show how the taxpayer could be landed with a €9m bill.
It is understood this amount may now have to be written off by the local authority because Greyhound Recycling has abandoned attempts to recoup the cash on behalf of city dwellers.
A Department of the Environment auditor has also admitted "it is unlikely much of these arrears will be collected''.
Details of the controversial deal struck between Dublin City Council and Greyhound Recycling have never been released.
Council bosses have come under fire after claiming the contract on the sale of the service is "commercially sensitive".
City politicians have now demanded the immediate release of all contracts signed between both sides.
Dublin councillor Mannix Flynn said the council should have collected the debt owed to it before selling the city's waste service to Greyhound.
"The city council is incompetent in collecting debt. The whole thing with Greyhound has been a disaster.
"The idea of the council giving over its debts to a company, which is not a debt collection agency, is nuts," he told the Herald.
When the city's waste collection service was sold in 2011 it was understood Greyhound would try and recoup an estimated €13m in unpaid debts.
However, only €2m has been collected, and already €2m has been written off.
The firm previously insisted on the sale figure agreed with the council for the service being kept confidential because "it might give others an indication of its pricing strategy".
A Greyhound spokeswoman said: "We outsourced the collection of the debt with the agreement of Dublin City Council.
"We chased the debt as vigorously as we were able to but we felt necessary to outsource.
"We are no longer chasing these debts. It will be up to DCC to come back to us in relation to any new arrangements."
DCC insisted it continues to have an agreement with Greyhound through which arrears due to it will be collected using a third party debt collection company. "Accordingly the issue of writing off of any amounts does not arise," it added.