Cell C bill me for something i do not even have

More than a month ago i app**** for a combo (Cellphone and tablet) contract for R229.00 a month with Cell C direct, everything went well till delivery. Cell C delivered two tablets instead of a phone and a tablet, so i phoned them to collect one tablet and to send me a phone, which they then did. I had the tablet and phone for two days and did not like the tablet so i phoned them to cancel the contract, in order for me to take something else with Cell C. A whole month went by, i struggeled to cancel the contract and phoned many times and everytime they would log a request but no one will attend to it, in the mean time they debited my account with two different amounts, both more than R229.00. (Ref ***), after this was eventually sorted out with lots of frustration and phone calls, i discovered that the other tablet wich was sent to me by mistake was activated on my account and that i am in arrear, i have phoned many times and everytime i have to tell the whole story from day one, they would log a request but no one is attending to it (ref ***), Saturday someone from Cell C phoned me and said i am owing them money and that my account is in arrears? really! poor service