Did you consult elders in the family, employee's/trade union leaders, your able labor law consultant before handing over a blank cheque to employer?
Did the employer demand to submit a blank cheque in writing?
Did you get any acknowledgment of cheque?
The cheque was issued in lieu of what?
Why did you opt to join such employer that ask to submit a blank cheque?
Did you submit leave application and do you have acknowledgment?
The elave was for how many days?
Did the company approve or decline the leave in writing?
What is this company: Commercial/Industrial?
How many persons are working with it: direct/indirect?
You were located in which state?
What was your designation and nature of duties?
You may ASAP approach an able counsel specializing in labor law with all docs on record and let your lawyer structure a suitable communication asking the company to not to present the cheque and return it and also to bank and to declare that F&F is erratic and demand is illegal and be withdrawn in writing.