Harrassment by collectors for Wesbank

My name is Vuyian Nkohla ID *** have my vehicle financed by Wesbank. I am up to date with my instalments but Wesbank is always harassing me with outstanding amounts which they cannot justify. My statement does not reflect any payment default instead i'm being charge for paying my instalments. The same things happened in 2013 and when I followed and reported it to the banking ombudsman then I got a call from wesbank and they rectified the error. After that they started again, I used to pay my instalment using the ATM's to deposit the money until recently. Therefore when I deposit e.g R7000 via the machine, it will take probably R2000 and return other money then I will continue and maybe it will take R4000 and return some and I will do this until the total amount is accepted by the machine. When i received called from Wesbank i requested statements and i realized that they are charging me for every activity that i do via ATM. Meaning if it took me 4 attempts to finalize the transaction then they will bill me close to R800 for the payment of the account.<br> <br> Why should i be charged for paying the instalments and i was using the ATM based on the advice from the Bank.