A contractor submitted their final invoice on Oct. 7, 2020, the invoice included a 52K amount for a change order and an additional 104,000 in a claim. After reveiw we determined that a total of 68K was warranted and issued a check in that amount, thereby telling the contractor that they could pursue the rest in court. The contractor is refusing to cash the check and claiming that they will still be charging interest on not only the original amount of 156K, but they are claiming an additional approximate amount of 150K costs that they "accrued" upon final review. My question is as I read the prompt payment act, interest does not accrue on disputed items, therefore, until an amount is agreed upon between the owner and the contractor for those disputed items, interest will not be calculated. The project is a local government project.