You don't want to cancel my contract

Yesterday I was at mtn and I asked what do I need to do to cancel my new upgrade, I was told that o need to call the retentions department. Today I called the retentions department I was told that I need to go to the shop if I need to cancel my contract. So what must I do now?? I was told o can cancel the new upgrade within 10 days with no charge but now it seems like mtn is stalling so that 10 days can lapse and I can pay a fee. I am sick and tired of your poor service , I will bring the phone on Saturday because I can't go to Clearwater everyday. And I will not pay any penalty because i was on time to cancel this ****, I will take my money and get a contract elsewhere .