What everybody has already said. Your painter obviously doesn't want to take back a project that will cost him time and money to fix. Don't give them an out. That is definately an adhesion problem. Take it back and ask them to fix it. Hopefully they will step up to the plate and agree it is a paint problem. If not I'd take it to another paint shop and have them analyze the paint chipping. Have them write a statement as to what they believe the problem is and take that back with you to the first shop. If they still aren't willing to fix it, then tell us where you are at.