Whats is the opinion of your own counsel specializing in labor-service matters?
Have you indded consulted an able counsel?
An employer can dismiss an employee without notice (summary dismissal) if he or she is guilty of a gross breach of duty or other serious breach of the employment contract.
As regards termination of employment for disciplinary reasons, some instances of misconduct which may justify dismissal without notice and any compensation in lieu of notice are listed in the Model Standing Orders.Sec:14(2)-(3) e.g;
wilful insubordination or disobedience;
theft, fraud or dishonesty;
wilful damage or loss of employer’s property;
bribery;
habitual lateness or absence; and
striking unlawfully.
Does standing order (model/Certified) apply to your establishment/your designation as per nature of duties?
Are you covered by the def. of 'Workman' as in ID Act , 'Employee' as in Shops and Establishments Act?
For proving gross misconduct employer should not terminate a person straightaway, and may issue a charge sheet get the delinquents response.If employee admits then the punishment in accordance with Standing orders/ applicable service rules and regulations, can be given.If not a Domestic enquiry is to be conducted by appointing a Neutral Enquiry Officer who will submit his report on which basis the Management will take a decision.
You are trying to take refuge in statement that you did not sign all pages of appointment letter, but signed (and did not cancell signature on last page) on last page only.IN any case you accepted the appointment order.
If NO demo Instrument was ever given to you, then you must deny in writing under proper acknowledgment.
In any case the earned wages, leave encashment, etc may have to be paid.
Rest your able counsel can advise you further.