Builders express greenstone hill

Bought a ryobi cordless grinder, had it charge, after a week from buying it i wanted to use it and then it was faulty, took it back at the 1st possible time for me, and now its been there for 3weeks, and no response from them, iv rented one that has been costing me a arm and a leg, soo i eventually went and bought a corded one for now, hoping that one day they will resolve this issue