********** account activity and no support from Edcon

I have been receiving requests for payment on a account which started off at R40 and in days has gone up to R140. I have a card with Edgars used for points however, I have not made any account purchases in years. I have tried several attempts through phone call and email to firstly make Edcon aware of the ********** activity on the account and to rectify to no avail. I do however receive regular phone calls from their call center for payment. When I try advise on the ***** and request further assistance, I am told they cannot assist - I must try a shop. The sloppy response and lack of assistance has lost the Edcon group a loyal cash paying client. Now I wish to cancel my card with the group as I have no intention of ever supporting them again but this to is a service they are unable to provide.