Contractor wants to "restart" the project with higher payment
US based, currently working with a construction company on a large-ish project (low 6 digits).
They gave me a bid that I've accepted and they did about 20% of the work (lots of disruptive demolition). It seems that there was an issue with the digital signature and the contract was never "officially" signed. However, they cashed the deposit and did one week of work.
Now they're trying to back out of the the agreement saying that we never had an official contract and they're willing to work on this project if we redo the contract and re-negociate a larger payment because one of their employees did some major errors in planning and bidding.