3 other cellphone numbers *****ulantly linked

I took a cell phone contract 2 years ago, to end by due date (end June 2015), shdn't it b automatic?. I received SMS notifications/reminder that i have exceeded my credit limit. So when deductions continued still, I went to a walk-in centre & requested to cancel contract - it was done. On the same day the airtime was reversed (R100). On 28 Jul 2015 I was welcomed back to MTN Pay Per Second. A week later on 1st Aug, a deduction of R145.00 was taken 4rm my acc. I enquired & was told must be the last payment (which shdn't have happened anyway). <br> Another deduction of R1780.68 followed on 1st Sept 2015. I was even more shocked so I called MTN and my bank to reverse funds. I was informed that 3 other cell phone numbers were added/linked to my cell phone contract which is why deductions continued even after my cancellation/ end of contract . I later requested that both these amounts be reversed which happened.I was told I should report to MTNSP*****, and submit affidavit, my ID copy and the 3 cell phone numbers ***