It would be helpful if you divulge the entire situation you are facing.
You can likely get School B’s and C’s transcripts directly from them, unless you also owe them money. It doesn’t really matter that school A is withholding B’s and C’s transcript, as well as theirs. If you are applying to another school, call it D, you will still need the transcript from A.
As others have said school A does not have to release your transcript because you owe them money, and no matter where you intend on attending next, you must send in school A’s transcript.