Grossly inconvenienced

I am utterly frustrated. In October last year my mom purchased AIWA bluetooth earphones at your kenilworth centre branch. Once I tested it. One of them were not working. I went to exchange it . Didn't get the greatest service which was addressed and it was sorted out ... 20th Jan I go and purchase the same brand for someone , it's tested and it doesn't charge . I had to trek all the way back to the store today, a lovely lady helped me at the counter, only to get home and surprise surprise one of them doesn't work. Who is going to compensate me for my time, energy and PETROL ,having to trek all the way back there to yet again exchange this???? I don't live in that area. I almost feel as if this could be the pair I initially returned OR pick n pay is just selling faulty items . I am very angry about this as I am being grossly inconvenienced in many ways .