Frankly, Mohsen can fùcking whistle for his bank details if that's his attitude.

Dear Ahmed

Kindly correct the attached bank details so that we can proceed with the
last payment. And I'm not happy with your work.
You delayed the delivery by two months./You have done nothing to reduce
delivery times.
You showed a complete lack of professionalism in executing my order.
We have to pay the penalty for missed deadlines of delivery.

Mohsen.