Civil or Criminal case be filed with mobile No.

If a building Contractor on mutual oral agreement started construction but creating a medical problems took more money than his eligible constriction part and moreover his work was totally unsatisfied as he did construction with a labour about whom he told us mason / Mastry. So when it was found that he will not give satisfied and finished work, he was asked to stop the work and make settlement of payment. He has signed while receiving payment. But he is absconded only mobile number is available. Under this situation what could be done? Any advice please.