MTN Carnival Mall By Pick and Pay

Hi I had a very bad experience at the MTN in carnival mall by the pick and pay I was due for an upgrade but went to the one at woolies they did not have the phone i was looking for then the ambassador took the one on display to the one by pick and pay showing the sales lady the one i wanted they said ill have it within 3 days which was done but it was not the phone i wanted the convinced me to take the phone just before closing time the next day i wanted to take the phone back and was told there's nothing they can do even if its less than 24 hours which is still in the package i was give i have complained about it to head office mtn but get the same response the manager will call me two months later and no call i have to follow up and all i wanted was them to change the cover from blue to brown.Then i get an email for sim insurance which i clearly told the consultant i did not want any insurance on the phone let alone on my sim It would have being ok but i had taken the phone i wanted to the sales person she had the phone in her hands but clearly did not look and care about the customer. this might sound stupid but its not right as i had seven days to take it back to the store if i was not happy.