Cell phone repair not done

In May this year I bought a mobicel phone, in August it was already giving me problems, I returned it to the store for it has a guarantee. They sent it for repairs which expectedly was to be four weeks. I called the store after seeing the time has passed noone bothered to call me. I was told it is not fully repaired, they need to resend it for further four weeks, after they have signed the inspection report that it was fixed. Am not happy with their service and it wasn't the first time.