There's a lot of curiosities about this case...
the original rep had some notes from the first place and had it in there i re-tapped and bigger bolts! ( which was a complete lie from the first dealer) got the bolts from the mechanic and correct tap!
This should be trivial to prove.
Have the holes been re-tapped larger?
If not, shouldn't be your liability, and you can demonstrate that they're the proper size (can't you?).
If so, who tapped them?
If the dealer, their liability.
If you, why did you use a larger tap?
If you were told to by the dealer, could be their fault.
If you did it independently, your fault.
Someone early on in this thread noted that the holes in the loader bracket are considerably larger than the bolts.
Is this loader supposed to go to this tractor?
Were those holes enlarged since purchase? By who?