How to find whose cheque has been deposited directly in our current account

Dear Team,
I am working for a Private Organisation. We have huge clients and some of them directly deposit their payment cheque in our current account without information to us. From our bank statement we could only get the cheque number, date of deposit and amount.
Every time it becomes a problem to find out which customer has done this payment. The bankers are also not telling any more
details on the same. Without knowing the details, we are forced to keep that amount in Suspense.
Is there any way to find out which party has made that deposit? Kindly advise.
Thanks
Chandrakala
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Send a general circular to all customers.
Request them to intimate cheque deposits with details of cheque number, date, amount, bill no: etc
Times of cheque transactions are over and we need to move to NEFT,IMPS etc.
When a cheque is deposited, minimum description is given in bank a/c which should help identify whose cheque it is.
Even SB a/c columns of passbook show these details you need to take up with bank at higher level to sort out this matter.

Sir, Thanks for the input. Will try to take details from Bank.