Have you tendered notice of resignation/period in writing under proper acknowledgment?
The said banl a/c is your personal bank a/c or salary a/c?
Download record of attendance, peformance, leave, appraisals, apreciations, etc etc . This and I.Card and even bank transfers may help you.
All affected employees may join hands and stand as witness to each other if required.
Does employer provide PF number and a/c slips/ESIC card ( if applicable)?
Some states do have enactments having clause on issuance of appointment letter.