LIFT
I am sorry to hear about your issues with LIFT
Unfortunately the second and final training payment to the company is payable once you start you PPL, so at that point you really are in a difficult position with all your money being tied up in the flight school
If you are going to sue LIFT you will need a good lawyer to attend mediation on your behalf in Mataram. We instructed Mr Gede Sukarmo of Mataram whose offices are close to the court. This should help to reduce your lawyers costs by using a local guy instead of having a Jakarta based attorney whose travelling costs and expenses you will be responsible for
Gede was excellent in our case and I'm sure he would be happy to help you too
Good luck with getting your money back and I hope you are able to complete your training elsewhere