WANT UPGRADE CONTRACT BE CANCELLED

Good day page 1<br> I've been with MTN Contract since 2004, but now I'm fed up with MTN I want that upgrade contract to be cancelled and not to upload any airtime on my number. <br> My Top up 100 Contract was expired done upgrade at MTN Midrand shop on the 14 March 2015 took Microsoft 535 handset within 13 days I was frustrated cause the handset was giving lot of problems, on the 27 march 2015, approached Mtn Midrand shop met George, he said the procedure I should personally take the handset to repair Centre as the shop had nothing to help with. <br> On the 30 march 2015, Say BIG UP TO Mtn SP technical service Midrand, they took handset without any hesitation as Fault was identified at front desk (no network connection), they gave me Job Card Ref, meaning I had to get another phone. Same day at Mtn Midrand shop I was told they don't have same handset on stock, they insist that I had to choose other handset as second choice, then I chose Samsung tab 4,sales consultant said will send my contract documents to retention Centre and he wrote that Samsung tab 4 on the front page of