START with a six-point socket instead of your 12-point. (Wild guess: There's a lesson to be learned here.) (Second Wild Guess: The bolts have corroded to the casting, you're gonna need heat, and you'll be lucky if the aluminum is saveable.)
I've removed lug nuts with those so-called "Turbo" sockets. They're tapered inside, with a "reverse-thread" machining that tends to pull the damaged fastener in, and wedge it as you turn the socket to loosen the fastener.
The ones I have are specifically for lug nuts. SK sells some intended for general purpose.
https://www.amazon.com/dp/B0007GGUEC/ref=psdc_553372_t1_B0007GGUE2