Mis selling of information

I was contacted to upgrade my cellphone from the call centre. Against my better judgement I decided to do that but since then everything regarding the delivery and the information has gone wrong. After 15 years with MTN I have never experienced such bad service ever from any company. The more I phone the more I get pushed from pillar to post. No one takes responsibility and when I visited a store I got told they can't help me because I was contacted via the call centre. Absolutely shocking for a company of this size. MTN creates problems and then just walk away. Another form of the absolutely shocking service we are forced to accept in South Africe.