Not everyone gets the same treatment!

Almost 3 months ago we bought a R400 cellphone from Checkers Cobblewalk, initially they gave us the wrong phone and we realized upon unboxing because the person behind the counter DID NOT OPEN THE BOX. We took it back and got a phone that worked for 1 week. When we took it back a supposed supervisor (indian lady)advised that they need to send it in for repairs. This is 3 months later and they CONTINUE TO HAVE NO FEEDBACK, and keep taking my number and say they will call TO DATE.. NOTHING from them. How long does it take to find a problem with a phone sold by them ? and why is ZERO effort being made??? This is the WORST service. DO NOT SELL ITEMS if you cannot manage the repairs or even something as simple as communication in your business which is ultimately the nature of your business...... DEALING WITH CLIENTS . It is appalling!!!!!!!!!!!!!!!