Frustrated with the edcon group

Hi all iam so frustrated with our account at jets , my husband opened an account November 2016 we made one purchase 30th november we then tried to use the acc again on the 3december only to find out the card was been blocked and some1 else is making purchases the store requested that we go get an affidavit and we did they took all paper work, we recieved no feedback after a month we went back to the store they said its still been investigated and that the account will be blocked after up and down and no help with the customer service agents we left it to this day no1 contacted us regarding it and we still getting emails of the person buying and they debited our account , so we want to know what happens to us as the customers , why werent we protected ,now what do we do to end this terrible ordeal