pathetic service

my upgrade was due since the 01.04.2015 i had a problem upgrading since than. To cut the story short i went into mtn campus square with my sister looking a for Sony T3 in white, they didn't have stock. The employee that was helping was very nice. She said the beginning of May she is going on leave but she will order the two phones for us , we even told her we will wait for her to get back from leave to get the phones, just to get there the Monday no phones was ordered that was on the 11.05.2015 so we said its fine she can order the phones. She advised it will be there is the week.Yesterday my sister received a call to say its available just to find out there is only one!!!! Apparently one of the other employee took the other one for one of her customer. I find this really unacceptable!!! My contract is ending in August im thinking about cancelling my contract and moving to another network. I used to tell my friends and family that mtn is the best network but i wouldn't advise them to join mtn. Im tired of complaining and getting no satisfaction.