Contract Cancellations

I am a contract subscriber and my contract expired end of April 2015. I called MTN a week before and after holding the line for more than 30minutes I was advised that I CAN ONLY CANCELL THE CONTRACT ON THE LAST DAY OF THE TERM. When that last day came, I called MTN again but this time their lines were not working (Like Today!!!) and instead I registered for self services and sent a cancellation request. Nobody contacted me to confirm my transaction, instead I called MTN again only to be told that my contract is still active because there was no cancellation request received. MTN please do me a favour and fix your house because I REFUSE to pay another subscription because of your technical issues or rather POOR SERVICE.