No service from this company at all

I took out a loan sometime back with Capitec, upon completing the application i advised the consultant that i get paid on the 28th and thus they should deduct their instalment on the said date. Last month i decided to check my loan statement to see how much is still outstanding on the loan and i was shocked to see that they are charging me interest on arrears of the loan. When i started enquiring about that, it was caused by the consultant putting my deduction date as the 27th instead of the 28th as instructed. This error has thus caused Capitec to charge me incorrect arrears fee and thus having a negative effect on my credit score as it might seem like i did not honour my side of the deal. I have tried endlessly to contact capitec so that this matter could be resolved however they keep on transferring me from one department to the other. I have requested the call recording of when i took out the loan but that too is in vein. I want Capitec to refund me all incorrect arrear fees that they have been deducting and to correct the debit order date as initially advise.