Bad customer service

I bought a sound system at cash crusaders on sunday around 12h00 pm and it was not fully tested due to shortage of accesories they told me that it will work better if i buy that cable wich they did not have instore.when i get home i noticed that 1 of the cable was damaged i went back to the store after an hour it was closed.on monday i went back there to explain to them and they told me that it will be booked for repairs i said how can i buy a product whithin an hour is goin back to repairs.i send them an email i did not get a response.