Well you made the mistake to agree with less amount. Since he default the court compromise, you can now claim full amount with interest. File of cheating and criminal breach of trust.
You approached court and justice rightly served you. Fault at your side that you failed my due settlement.
Well, file FIR for fast recovery and full amount. You can also file contempt against him for violating court compromise.
Notice will serve on whats app. ON same cheque, fresh suit will not file. Can file recovery suit and contempt.