Breaking the rules for treating customer FairlyS5

On the 28.07.2015 I went to buy cell phone on contract of which i am already using a mtn number ao i needed them to convert mu prepaid sim to top up contract to avoid having two different numbers for the same network.the person who was helping me so happened to be the manager as well.he said that it was not possible to convert.when i got home I called the mtn customer care to ask if that was true and they told me that its possible to turn my prepaid number into a contract.so i went back to the outlet and when i told the person who was helping me that day when i went to purcha2 a d phone and suddenly the story changed,he said he couldn't do it that the first day i came becauae he was having system issues.so now i am being sent from pillar to post.today its the 15th of august and i still havent got the response and i still havent used the phone.o have been using mtn for morw than 2 decades and this is how they treat me as their so called valuable customer.i am seriously no happy.i mean qho is supposed to help us when we have complains if the manager himself is giving bad service and not adhering to the Treating customer Fairly policy?