5.57 Flying schools: transfer of student records
Interestingly there does not seem to be any penalty provision (unless there is a general penalty provision that I couldn't find) for failing to comply with 5.57.
If it was me, I would ask your new CFI to make a written request to the previous school for the log book and records to be transferred.
If that fails, I would be following kaz3g's advice, although the Police would in all likelihood suggest that it is a Civil matter. (However you never know your luck, one may understand your dilemma and make a call on your behalf).
That then leaves the Magistrates Court. The Clerk of Courts would probably provide advice of what Civil action may be available.
Good luck.