Incorrect billing - no refund

Two years ago I changed from Blackberry to Apple - but when I changed the BES/ BIS was still being charged to my account.<br> For two months I have been trying to get a refund of some R2600.<br> Every time I phone I just get a new reference number, customer service cannot put me through to accounts/ contracts to sort this out.<br> I've been told my account has been credited. I want to speak to somebody in charge - not always just a customer service person who is friendly and all but just cannot help me <br> I don't want my account to be credited - I want a refund!<br> Cell C took the money off me every month so I want the cash refund<br> I have been a client for over 10 years and lately I've just been very unhappy with the way this has been handled.<br> Nobody from contracts or accounts has bothered to contact me regarding this query and it is their department, not customer service! I have to do all the phoning.<br> I am extremely unhappy about this and would like somebody in authority to call me please.<br> Thank you