Sounds like another moron installed his brother in laws floor, he was shocked at how much money he saved his brother in law that he went into the flooring business.
In my area there are a dozen “phonies” on Craigslist and NONE of them instsll carpet because all they ever played with (notice I didn’t use the term “install” ) was click planks.
I even know a ceramic dude (not installer ) that won’t touch LVT “because his guys can’t get the floor that flat”
I’m sorry you got hosed but you got lied to about what is required to install your floor .
I have some really bad news for you. The guy that did this isn’t qualified to fix it.
More bad news , if you don’t use the right people to fix it you may end up literally losing the material that’s been installed and probably have . It doesn’t just come apart these joints aren’t designed to be taken apart over and over again
There is no good answer sorry
In comparison I charge 2 bucks a foot just to instsll planks of any design much more for wood. LEVELING , REMOVAL, FURNITURE is extra. Sometimes the removal and leveling is twice as much as install.
The craigslist installers “start at a dollar”