OK Andy, dont despair. Once again thank the tyre guys that they were willing to do the repair and acknowledge that the original repaint is poor. But whos to say, if the paint would have come off if their guy had been more careful. You then go on to say, how about the wheels are repainted properly and they share some of the cost equal to what they were prepared to pay anyway. Talk about how great they've been so far and how you've been telling all your mates so. Its worth a punt.
As above - don't worry about piggy in the middle yet, your position is still right. Have you had tyres replaced since the refurb before this time? Whoever replaced the tyres last time managed to change the tyres without damaging the wheels.
I'd also come back to the point made by someone else further up - a reputable company would have stopped when the first one flaked and would have called you to let you know, so that you can make an informed decision about how to deal with it. At that point you could have taken the wheels back to the person who did the refurb and dealt with the issue with them. As a result, you can no longer do that because they decided to go ahead and change all of them, regardless of the damage being caused, and the original company is unlikely to give you the time of day now as a result.
The bottom line is regardless of how bad the refurb was, the wheels have been damaged while in their hands.
Also... isn't it convenient that their
appointed repair centre have commented how poor the original work was?! OK so that might be true, based on comments others have made here. But as far as you were concerned, they were a set of refurbed alloys which were in good condition before going in, and have come out damaged. The bottom line is as a 'normal' consumer without a higher level of knowledge about alloy refurbs, you would be within your rights to ensure that they were at least repaired.
I'd give it some thought about where you stand on this, and whether you want to compromise at all. You might get lucky and they agree to pay for a full refurb as a result. But they might get a cheaper job done to make them look pretty - you won't pay anything but you might not get the full top quality job. Or equally you might contribute towards the cost; you get a proper refurb at a partial cost. I'm not saying any route is necessarily right - just saying you should think about where you want to end up - would you be happy with another half arsed job which might only last until you need to change a tyre again.