Two prices for the same offer, due to internal MTN admin issue

Yesterday I tried to upgrade from my existing MTN contract (which has been due for an upgrade for some time). The phone I selected was available, yet I was finally told that it was not possible to upgrade at the price stated in the MTN brochure. Reason given was that MTN was in the process of upgrading its internal systems and only customers that had already been moved to the new system were able to get this offer. As I was not yet moved they could only give me the phone at a monthly price of R560 (i.e. R160 more per month = an additional total cost of R5,760 over the contract period - absolutely ridiculous to lay such a cost on customers for what is an internal MTN administrative move). There was nothing in the brochure or online communications that indicated the offer was only valid for some customers. The team at the store apologized and did say they would try to resolve this for me. But when asked how long this would take they gave me a timeframe of at least two weeks. Ridiculous! I've laid a formal complaint to MTN and waiting for a response.