*****ulant transcations on my shop account card.

I have not used my RCS Builders store account card in over 8 months as I am wanting to pay it off and close it. Last month I get two sms stating I have just purchased something from Shoprite in Umlhanga. I phoned RCS immediately stating this was not me as I am at home in Johanensburg. They block the account. They tell me I need to get an affidavit stating the transaction and it was not me etc. I do this and 20 days later I get an email stating they have investigated and that the transactions will be reversed. This is only done in the new month but still have been charged interest etc for something I did not even do or buy. Very disappointed with their service as their system should remove all charged, interest etc.