Given you paid to have it restored (which I assume was the bore only because the outside looks unrestored), I’d take it back, tell them what’s happened, and see what they say.
Worst case, they don’t accept any responsibility, and you either have to pay them again / more, take it somewhere else, or do it yourself. But, at least it gives a chance they might fix it under some sort of warranty, or provide some explanation that might help decide the way forward.
It would cost nothing to take back to see what they say…so nothing to loose, really.