Paying for something I don't have

I was contacted via phone by SellDirect about a sell phone deal which at first I accepted. After taking the deal I realised that I do not really need another contract. I cancelled the deal within two days and sell direct sent their couriers to come and collect the unopened package. Low and behold, end of the month the money goes of and I already received another statement with even higher amount to be deducted of my account. And yes, you guest it correctly. The frustration starts with endless calls to Telkom and Selldirect. Telkom says its not them and Selldirect says its not them. I can tell you this. Out of maybe a 50 times trying to call Selldirect I got hold of someone twice.( You can actually sometimes hear them pick up and put down the call) The first lady tells me to send and email and explain the situation. Still no Response. Surprise surprise. The second lady tells me there are no sims activated?????? So how come the money went of. I am truly fed up with passing the buck in these big companies. How is this possible that the people working for them does not know how to deal with this kind of problem. Incompetence is not even the word. Stalling tactics are the norm with these companies. They are purely there to take money from people and no one are interested to resolve the matter. No idle threats but I am reaching a point where enough is enough.