MTN Contract Woes.

My MTN contract was due to end on the 12 April. I called months in advance to understand how to cancel it. I was given about 7 different versions from their consultants of how I can go about cancelling it because I did not want to renew it. I then decided to rather email them so I have it in writing, they did not answer my questions there too. Again this week I called to get the info I need to end this contract because it was not a good contract as my data depleted quickly each time I just wanted to use it. The consultants told me I had to give them 30 day notice that I want to cancel a 24 month contract. I questioned this until I was red in the face. They told me that to end the contract without being billed for an extra month I would have to migrate my number to prepaid. I called on the day they told me to call which was 13 April. They migrated my number, then I was transferred back to accounts to confirm that I had nothing due to them. I must say the consultant was rude, who I dealt with in accounts. All of a sudden she could not hear me, while I was speaking to her about my account, she made sure that her word was final. I then ended the call. The accounts consultant told me I still had money due to MTN which contradicts what the other consultants told me that my last payment went off the previous month and what would continue in my contract is the data cost. So again MTN give you different versions of their contract policies. This is not the 1st time MTN has given me bad service with my contract especially when it has to end. I think they did this deliberately so that I remain indebted to them. I mean why is it a headache to tell you that I do not want to renew this contract and why cant MTN give a straight answer and 1 version of the truth of how to end a contract.