Unhappy Customer & poor customer service

I bought a sound bar from fastrak & within a period off 2 months It wasn't working, it had power failure. The guy I bought it from by the Name of Thando adviced me that if anything happens to the sound I must bring it back with the packaging as I have still have the warranty. I 1st went to fastrak commissioner in jhb and the manager said there's nothing he can do I need to take it back to the randburg fastrak branch. I then went there, luckily Thando the guy I bought it from was in store and he checked the sound and said they must replace the sound. Then the manager who claims to manager was nothing but useless and she doesn't know what's she's doing. They said she cant replace the item and the only thing she can help us with it booking for repairs and only get to me after 6weeks... she had bad attitude and doesn't know how to treat the customer right. I'm not ending here I'm going to take this matter even more feather. Us as customers we spend our money that we worked hard for and only to find out we support useless business like fastrak.