Failed to increase credit limit

On Friday MTN phoned me and asked me if I want to upgrade. I agreed and went through the whole process. It was explained to me that a pro rata amount would be added to my account. I agreed to this and everything went fine. Friday afternoon I got an sms stating that my services has been suspended due to exceeding my credit limit. This was because they added the pro rata amount (on a credit limit which they set). Since Friday I have been struggling to increase my credit limit and get my services activated again. I finally got an email from a Eileen Van Wyk (Reference Number: ***1) stating that my credit limit has been increased to R1700. This morning my limit was still sitting at R1200 (original amount) and again got the service suspension smses. Again no one can help me and emails need to be send to the back office to increase the amount. No one can contact this mythical back office, so I have to wait again and hope it happens. So, I am cancelling my account and moving to Cell C. One would think with all the fines against MTN, that they would actually like to keep their customers. I guess not. Pathetic service yet again from them