Edgar staff must have cloned my card

Edcon does not even deserve one star from me. So today I purchased baby stuff at Jet Carlton Centre Johannesburg. I was told that my account my was maxed and I owe more than R9 000. How?????? My last purchase was on Saturday 08/09 And my balance was just above R3 000. I was told that on Sunday the 9th someone used my account to purchase goods worth more than R6 000 at different Edgars stores in Johannesburg East. How did that happen because I had my card with me. Well I am definitely not paying R6 000 for goods that I did not buy. I see I am not the only customer with the same complaint so why can't Edcon fix this? So their employees can clone our cards and buy stuff in their shops. This is ***** at it's highest level. Someone has to investigate this and sort out my account. I will only pay what I owe them not This R6 000. Sorry about that.