Ensuring the delayed second payment of a bounced cheque by defaulter

I hold a bounced cheque with the amount of AED 400,000 against the defaulter, that bounced in December 2017. A police case filed the police station.

The defaulter has my account number and made a cash payment of AED 202,000 into my account, thereby having a proof of the money deposited in my account. The total amount currently owing is AED 198,000.

The question is:

Since the amount currently owing is AED 198,000, can I still proceed with a civil case against him?

I have not given any clearance, nor have I accepted any further cheques from him yet. The defaulter promises to pay the remainder of AED 198,000 by July 2018.

I think defaulter is trying to play a tactic so that he doesn't pay up the full amount. Can anyone shed any light on this area?

Is there any way I can get a court order or a legal document signed by him and myself, along with a lawyer or witness, stating that he will have to pay AED 198,000 as promised by him?

In case he decides not to pay, can I use that document in the court?

Thanks