Most alloy wheel centres and good tyre fitting shops have one use tools that can form into the shape and allow the bolts to be removed. I had this trouble after a timing belt change. It took two men with one of the tools on a breaking bar and the other hitting it with the force applied to help break the hold like an impact gun would using a full sledge hammer to with no alloy wheel damage after that I threw away the locking bolts. Tyre fitters and mechanics doing them up with impact guns can destroy them even if you got a new socket the bolt maybe too far gone and destroy it. A bit of copper grease on the threads helps stop the issue. The box your car has with the locking socket has the code on it and you should have two sockets but its not a perfect world. RAC might be able to help since it's a common problem I'll see if I can find the tool used I think it was a Bergen make