I've never had rings gouge my cylinders in the dozen or so engines that I have built. If the cylinders were grooved before the engine was bored, and the grooves were still visible after (the oversize was insufficient to remove the grooves) then the machine shop should have contacted you before assembly.

Good luck getting them to admit fault and offer a truthful explanation. The only marks you should see in the cylinders are crosshatching from the hone. (Period)