Ford Escort Cabrio BJ.94 Rear wheel bearing nut does not open

Ford Escort Cabrio BJ.94 1.8 liter 105 hp, Zetec engine One hears strong wheel bearing noises that get even stronger at left turns. I suspected the right front wheel but it sounds more like the right rear wheel. In fact, “this rear wheel bearing bubbling more than the left rear wheel when you turn it upside down. I wanted to untie the central nut of the wheel bearing but it doesn’t work. It seems crazy to eat – it doesn’t have a splint. With a long style h first I blow up the extension of the 30’s nut and then the nut itself. With a 12 volt impact wrench the supposedly 340 NM can’t work either. Warming also helped nothing. What should I do? Does a impact wrench for my compressor bring what? Or does it destroy only nut and nut? If I destroy the mother with the chisel (sounds like that at all) I certainly damage the thread of the axle. Does anyone have a tip for me! Thank you very much already!!! Love Greetings Helmut