Bad service from Call Centre & breach of contract

Took contract from Autopage, Randfontein. Advertised on display,Blackberry 9720 with R110 airtime 25 sms incl BIS R162pm on the 16/4/2015. Sales lady later phoned me to say it said a mistake and the contract is R280. I refused the contract and cancelled and was later called to say its fine, I will pay R187.50, took the contract. shortly after that, airtime and contacts were disappearing from the phone and I was being debited twice in one month different amounts. I phoned Autopage Head Office various times and I was put on hold and cut off and never receiving any feedback. The call centre people were rude and ***********. They confirm that no airtime has been used but cannot explain why the airtime is gone. asked for itemised billing but nothing came through. The phone I am using is being hacked into and profiles on facebook created but no explanation given. They claim that all calls are recorded but when I ask for recordings I get cut off. I am really disappointed in their service and would like to cancel this contract. I have to go to the bank every month to reverse unauthorised amounts being put though and they cant take any responsibility. They must just come fetch this phone.