During the acquisition by the new company, did you sign anything to be continually employed by the new employer?
If not mistaken the type of acquisition would differentiate if new company takes everything as is, existing contracts, liabilities and all or it was an asset purchase hence employees only continue working if they agree (which they'd need your agreement, hence the signatory.)

If it was the former and everything else is still the same the bond should still be valid as is.
If something changed then you need to get clarification on everything between you & the new employer, including your existing bond.
This usually means renegotiation of existing terms, not full invalidation of whatever running agreement between the two of you.

If you really really want to go to the new company just pay the bond remainder.
You might think it's ill-advised but that's why they (the previous company) bonded you in the first place, to ensure they get proper returns on their investment on you.


p.s. Kinda talking out of my ass, best to go asklegal / labor office / industrial court.