Download evidence of everything and build irrefutable written record.
You must place on record everything that you have posted in your query in writing under proper acknowledgment to internal authority/management…………………………including that on dated…………………..Mr/Ms………………….banned you from entering the college and to perform your duty in office.
How the signatures are faked: signed by someone else or digital signatures?
Have you by any document authorized the college employees and management to place your digital signatures?
The unpaid wages are debt on employer.
Your able counsels in Labor Law Consultant/Service Matters Lawyer/Law firm may opine that you can lodge complaint u/s 406,420, winding up petition, civil suit with damages, recovery suite etc…………………and that you can approach University Authorities and authorities under State Education Act.
You can also take help and support from various teachers associations.