renewal of contract

<p>I last renew my contract with Nashua Mobile in 2012 then after it disappeared I was moved to my service provider which is mtn now is 2016 I've decided to renew my contract over the phone of which was successful. When the phone comes is with tiny sim card and I have big sim no one has explained to me that I need to do sim swarp at the mtn shop of which they don't have the branch in Phuthaditjhaba. I tried to call mtn I could not get help until now I was given some offers that came with the package that I chose they have expired now I'm paying for the phone that I'm not using. I'm really not happy with the level of service received, sometimes when you phone call center they drop the phone without being assisted. I just want to cancel the contract </p>