Directors of Highland Quality Construction told the Scotsman that Highway Management Contractors tried to pay them less than the agreed price for work on the motorway upgrade.
Bosses at the firm – which went into administration last month with the loss of 138 jobs – claimed they were “bullied” by the consortium which consists of Bilfinger Berger, John Graham (Dromore) Ltd and Northstone (NI) Ltd.
A spokeswoman for the consortium said the claims were “completely and totally inaccurate”.
A local MSP is now calling for an investigation by the Scottish Parliament into HQC’s demise.
Highlands and Islands Labour MSP Rhoda Grant said: “I believe Highland Quality Construction have been hard done by.
“I want to try to ensure no other Scottish firms find themselves in such a desperate situation again.”