REFUSED PAIDUP LETTER AFFECTING CREDIT RATING

I have an account with Woolworths which was handed over to MBD . for slow payment after I was retched. I started paying the accounts to Woolworths but getting calls from MBD in June I was told my balance is R371 as per norm I went to Woolworths and paid R380 on the 25/06 .July begins and am being told I now owe R405 asked where it coming form they tell me am told my last payment is not reflecting because I paid directly to Woolworths I asked a question that no-one told me that am supposed to pay directly to them and all these months I have been paying directly to the store with no problem and no-one is giving me a respond . I phone Woolworths and am being told they received the payment and MBD Credit Solutions. should give me a paid up letter in fact woollies usually contact them and woollies transfer the amount to them . MBD Credit .is refusing and Woolworths is very slow in assisting cause am being told their legal dept.is handling the issue with MBD. My problem is I have e-mail MBD proof of payment but they still not resolving the issue which is affecting my name of credit bureau . I just want to WARN people about these collect agents which rob us and charge us ******* FEES