Payment not correctly allocated after 3 calls to the Bank in 3 consecutive months.

I missed out vehicle payment only in June. Paid R10000 in August to cover up the gap. I received massages a month later of outstanding amount. I called the Bank. We clarified the issue. They promised to correct it from their side. The messages of outstanding amount continued the following month. I called; same promise was made. The messages continued the next month. I called. Same promise was made. Messages continued. I called for the third time. Same promise with added information requiring R1075.00. The amount was debited. Messages continued, and I was handed over to Barman ... Attorney's. I am DISSAPOINTED.