not stopping

Wrote on 7 July: Bought Samsung with 2 gig data sim in April 2013. 2 gig data sim was ****** on 27 February 2014. Reported very next day. mtn said will suspend the card. 21 April 2015 contract over and done. on 28 April sent email asking to NOT renew the contract. R369 was deducted every month. End April R1113 was deducted. went to inquire on 12 May, said I must phone *** and R1113 was taken because my line is still active. did they not suspend it???? After 12 of May, calls was made 7 times, one call lasted 10 minutes and I got tired of listening to: did you know...Emails was sent to customer care and collectionsadmin 9 times asking them to NOT renew. End June taking R451 again, resulting in another email sent on 25 June at 23:45 <br> Got response on 22 July. why is sim still active? did you not suspend the sim?? On 25 July another R125 taken again, resulting in R1025 being taken for no service whatsoever. But mtn said on 22nd they repay R250. could you please give my money back? And make the sim unuseable!! I am paying for stuff I did not sign for and do not even have.