Car not been in good standard

I lost trust in this ppl. This ppl sold my brother a car and few weeks later dere was some problem with it and they took it to fix de problem but after 7 months de car now is having more problems. Almost a month now dey keep on promising to fix it and now no one want to take responsibility. This is the ppl which we need to think twice b4 doing business with dem. is a regrettable business we ever done and with a big company like dis I never thought something like dis will happen.