Airtime, SMS's and data loaded on cancelled contract

<p>On the 17 June 2016 I requested a contract cancellation after I was told I must pay a contract upgrade fee, and I was advised that the contract will be cancelled within 30 days. On the 13 July 2016, airtime, SMS's and data were loaded to the contract number that's pending cancellation. Today 15 July 2016, some guy called me to confirm the cancellation, I then told him that I don't want the airtime that was loaded to this number, and asked him to help with that, he refused to help, I then asked to talk to his manager and he refused to transfer me to the manager saying he's calling from his cell number and then hung up the phone. How do you load artime to a contract that's pending cancellation? I've been getting a lot of bad service from mtn lately, hence I don't want your airtime. Please take back the loaded artime, sms's and data BECAUSE I DON'T WANT IT.</p>