The problem I see is using a seat tube decal pattern for the down tube. I strongly question whether the decal(s) are as described. That is separate letters positioned on a painted backround/panel. That each letter is so evenly off center and not a hint of being crooked/rotated in place, that this pattern has been available as one large wrap around the tube decal (with the blue "panel" being on the decal) collectively suggest this was a seat tube decal.
So the questions that would bother me are- Is this actually a single decal? And what did I actually pay for?
A single color paint job with a single decal application should be far less cost then a paneled paint job with 8 individual decals.
Here's a link to a source for this decal as I've described
T - Trek - Page 1 - VeloCals Note that it comes with a similar down tube decal. So the last question I would ask is why did the painter use the vertical decal on the down tube and not the typically used horizontal one? (Of course I know one reason why... He messed up that decal and continued with what he had on hand instead of stopping and talking with the customer).
At best the OP needs to move on. At worst he and the painter need to talk about what was actually done and what was paid for. The truth might lay in the middle too. But at face value somethings not matching up, and it's not the alignment of the letters. Andy.