Cancellation

I have been with Vodacom for 21 yrs on the same number. My contract was due to expire on the 22nd of August 2015. I decided not to renew the contract as I don't use my phone as much as before. On calling them they tried to sell me into a lesser contract which I said I did not want. I was told she had already generated the order and I would receive a new phone the next day. When the delivery guys brought it, I sent it back immediately. That contract was cancelled. I was then told my original contract would automatically expire on the 22nd of August. So today being the 1st of September I decided to check. I called Vodacom and was told they had already invoiced me and can't reverse it. I then told them to cancel the contract as per the so called automatic cancellation and that I would not pay another cent.. I was told it cant be done. After threatening to cancel all 4 contracts with them they SUDDENLY decided they are able to reverse it immediately. Vodacom customer care is pathetic and they try to bully clients into new contracts. I'm still waiting to see what the outcome is. Maybe it's time to move all 4 contracts to Cell C who are begging for them and even willing to pay .