"Suspense Account"

I have been told by Nedbank that the in branch deposit and atm deposits I made towards settling my nedbank credit card have gone into the suspense account and as such I should look for the atm deposit slips in order for them to see where the money went to????? I managed to get blank slips (white- as the ink goes off after some period of time). I have informed them of this and all they are saying is sorry mam we cannot assist you without those slips... Is there someone that can please assist me in this regard. I have been paying since August however the balance never went down instead it went up as "NO-PAYMENTS" were made into this account because the money went into the suspense account.

1. Why did the Nedbank teller take the first deposit I made in the bank if the account was closed?

2. Why was I still able to deposit this money into this account that "can take money but can't show where it went to"?

3. How does Nedbank take money from a client and not try to follow up if the client was refunded or if the money was transferred to the right account.