Horrible Business Ethics

I have been following up on this matter for over 2 months now. I paid up my account that was with Woolworths and made a payment on the 13th of June. I was sent from pillar to post and still I have not received a paid up letter whereas the account keeps accumulating interest. You guys are super horrible and at this point I don't understand why the ombudsman does not investigate your processes. No one is giving me a clear answer as to what happened to the money I paid to settle the account and I'm being harassed with calls.