Nightmare to cancel my contract

I am totally frustrated dealing with MTN after being a loyal customer for close to 20 years. What an absolute nightmare trying to get a settlement figure to cancel my contract.The call centre says they can't handle it and I should send an e-mail to \retentions"which I eventually did on the 16/09/2015.I received an automated response saying I will get a response within 3 working days but nothing till now. I have phoned the call centre several times and each time I have been provided with different contact numbers for the retentions Dept. It's almost as if I'm deliberately being shuffled around because I've indicated that I want to port my line to another network. I wonder if this \""retentions\""Dept actually exists. It's truly amazing that a company like Mtn cannot help you through their call centre when you want to cancel a contract. I have always been a loyal Mtn customer but I guess their true colours show. Even if I had two minds of changing my network I know now my mind is made up! !! """