Jetmart Mitchell's plain

On Friday I bought a pair of bounce 2 ball series high-performance headphones at jetmart Mitchell's plain town center, yesterday after only 5 days of use only at night one side of the headphones sound its totally faded very little sound coming from it, can you please sort it out because I don't have time to argue with arrogant jetmart staff, I already had to take a display cellphone on Friday instead of a new one out of the box and on top of that the person who helped me told me he is going to add insurance instead of asking me if I want insurance, I then had to tell him he can't just add insurance because I don't want insurance