Adding mobile services on account without permission

I received a statement in September. My account was fully paid for a few months. By luck, I checked my statement and saw an amount that is payable (I would not check my statement because I am 40cents in credit for the last few months). A new compulsory amount of 22.80 is added to my account, when I queried this amount they said they informed me about this compulsory amount (did not receive any notice). I also saw on my account some mobile services was added. I did not give any permission and did not ask for any services to be added to my statement. I phoned Edgars and the referred me to the mobile division. I asked them to cancel this services as I did not request it and write back the money as I am not going to pay for a service I did not request. They said they will get back to me. This month I did not receive a statement just an email informing me I am behind and the amount is double now. I phoned Edgars again and they referred me to the mobile division again. I asked them to please cancel the service and write it back as I asked for it a month ago and now my credit record is bad because they did not do their work. They said someone will be in contact with me. Still nothing. I went to the store today as they advised me that the store can sort out this issue. They also went through the same steps. the mobile division will phone me. how many days do I have to wait to be phoned back? now they are not going to do their jobs again and charge me for the service + interest next month?? BAD SERVICE!!!!! I want this sorted out so I can close my account. Don't understand how they can just add stuff to your account without your permission and then you have to make several phone calls to get it removed and they say they will but nothing HAPPENS!!!!