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You a better penetrating lube such as pbblaster, kroil, acetone & trans fluid mixture or something better than wd40. Also some heat, torchs are cheap. Are you using a six point or 12 point socket? i would soak it a penetrating fluid, not wd40, put a six point socket on it, give it a few hits with a hammer and then try to break it free. If that doesn’t work heat up the bolt, you wont be able to do just bolt so apply heat to the entire area and again, a few wraps with a hammer and it should back out. Remember to keep threads lubricated as you twist it out and go slow, screw it out a little spray it, screw it in, out a little more spray it... etc....or it will snap halfway. Also an impact gun should take that right out.