Disgusting service regarding a simple upgrade

Good afternoon!!!<br> <br> I am beyond frustrated and annoyed with MTN now!!!!!<br> <br> I am a long standing customer for over 8 years now and I cannot believe that you guys cannot get a simple upgrade done correctly!<br> <br> I was due for an upgrade in March 2015. I had requested to cancel my contract but the retentions department had called me and offered me 3 months free subscription if I keep my contract in place. <br> <br> I decided to take up the offer so I requested an upgrade to be done with the above offer. My contract was subsequently cancelled and I was made a prepaid customer. I then called in because this was an error and then my contract was reinstated. Now they have reinstated my contract without my corporate discount that I normally receive, I didn't receive a new cellphone device. I also wanted to be moved to an anytime 500 contract. The 3 months free was not instated. There's an endless list of problems here and when I call the call centre I just get no service!!!! The people attending to my call cannot see any history or anything. It is just infruriating and I just want to move my business to Vodacom now because I have just had enough!!!! I am beyond disgusted with your service!<br> <br> 8 years I ha