REFUSES TO CREDIT MY ACCOUNT

On the 01-05-2015 I went in store to query being charged for blackberry services for almost 2 years when I have an I-Phone. the lady helped me and sent in the Request (***). a couple days later she phoned me and told me that the request has been approved but I have yet to see a credit on my account! I am highly upset that I renewed my account with MTN has I feel that I am no longer getting the great service I used to. One can no longer phone the call centre and receive help and if you do you will land up waiting hours on end. I am extremely unhappy with MTN at the moment.