Mobile Contract cancellation & Content charges

HI,<br> I have called MTN Customer care to cancel my mobile contract 20 days ago and still my contract is not cancelled. i called customer care thrice and the call center agent says they are escalating to cancellation department . MTN has billed me this month again . <br> MTN also billing an additional 50 - 70 R every month on the name of content charges. i have called the Customer care to cancel the content charges in October and when i checked every month on phone with dialing *141*5# option 3 , i see I am not subscribed to any services but still they are billing that amount.i even went to MTN store and they couldn't help me. I have all the reference numbers for the calls.<br> can you please sort out this issue.