pincher

My T4-14 gen 3 ran for about 4 Sundays then blew another 2 have blown since then. G&G are meant to send out new mosfet's in the new year, was it a bad batch or bad design? I know my nippers G&G cost half the price and works beautifully. My supplier said G&G will not take duff items back, then don't sell duff gear. Why can't G&G not be answerable?