Wrong contract canceled

I canceled my contract with MTN on the 20th July paid it off and requested for cancelation on a number which belonged to my deceased uncle then 5days later I went to a mtn store in sandton and was told the contract is still active when I was promised it will be done in 3days I even fowarded proof of payment then boom I'm being billed still for a number that should be canceled fast foward on the 18th of August I spoke to a retentions lady who took over from the first one I was in that line for 1hour2min41sec nomvuso assisted me and tried to downgrade a contract which was already meant to be canceled and I told her I'm not interested and was due to get refund for what I don't know ,then I told her to cancel the 073 number as the 060 was a router Sim which she said she will cancel I was not happy with her tone of arrogance while assisting me cause she wanted me to as she suggest not what I was saying then requested for cancelation didnt even give me a ref number I called again same day at 14:26 spoke to onica for 21min40sec who confirmed nomvuyo did put in cancelation and she gave me the ref which the previous lady failed to give me got cut off while onica was putting me through billing department ,now on the 19th I wake with data thats not working because my router was migrated to prepaid which is weird as I didn't request for the router to be canceled and didn't pay it off so its weirs how it was quick to suspend the router but took so long to cancel the number that I had paid off and requested for it to be canceled now I must wait 72hours while they investigate says Nathalie from retention dept such inconvenience and inaccuracy from mtn personnel I am not happy at all I want to leave mtn they are a **** its a waste of my time and inconvenient ,I have emails sent for cancelation non of that is considered what must I do in the mean time really .