I assume you paid in cash? Otherwise, maybe put a stop payment... But yes, much of this is "on you" for taking his word for measurements.

As you said, okay for now, size-wise, but not what you wanted & not what you need long-term. Ugh, 8 hours drive too...

Before you drove to get them, you should have insisted on photos that included a yard stick next to them, at the very least. Life lesson, I guess...

Since they're obviously used cages, you need to DISINFECT them to the max also. The thing with used cages is that sellers never tell you (the truth) what the previous occupant died of...get it?