Standard bank VAF incorrect and bad service

I requested a settlement letter on 21 March 2020 and paid that exact amount on 24 March which was within the period allowed to make payment. I do have both documents the settlement letter and payment confirmation. But after payment there was still an amount outstanding, when requesting another settlement letter the new amount was minus R95, which is impossible to pay, yet a debit order went off 2 days later. I’ve tried calling VAF no answer and I’ve tried speaking to prestige team they don’t have access, just so frustrating dealing with these people! Total amount owed was just over R80 000 Number of periods remaining was 24 months Settlement was R73 000 Payment was R73 000 then account reflected a balance left of R7000 And still deducted few days later R3700 payment for the month I have all the paperwork, such a ripoff