So many folks say "Oh, just rent it out, you'll make gobs of money
as an absentee landlord, just get a management company they'll do everything, there's no risk".
This just goes to prove that ain't quite so. Sadly.
But the OP still doesn't get it. There's a management company and I'll BET there's a signed CONTRACT
stating what the company shall and shall not do, and what the rates and fees
will be, including how the labor charges will be made.
Not that management companies can't be liars and thieves like anyone else...But this forum is the wrong place to come for help.
If there's a contract
, you'll need to enforce it. If they are within the contract terms, you'd need to go to court (unless arbitration was contracted) to try overturning it.
So either go to court, or fire them if you can and fly out to see what really is there, or pay up, take the loss, lock it up and sell the property.
There's no magic bullet for "I didn't know what I signed or who I signed it with." There's the courts, or paying up.
Then you move on and do the Baja