Cancel my contract please!!!

I have been struggling to cancel my MTN contract for 3 weeks now.<br> <br> My contract has ended last month,but I'm unable to contact MTN to stop it.I paid my account in full and told the the lady at the MTN branch that I want to cancel my contract.They told me the same story:Please call the call centre.<br> I tried calling 808 to try and cancel my contract over the phone. All I get is a woman saying \The call center has been disrupted and they apologise for the inconvenience". And then the line goes dead. I went into a MTN branch again to cancel it there but all they could tell me is to phone 808 from my MTN phone. I've been phoning 808 ever since and I keep getting the same message saying the call center has been disrupted.<br> <br> I WANT TO CANCEL MY CONTRACT NOW!!!!!!"""