Generically speaking: As the company has issued the termination letter therefore, the Bond/Service Agreement, security cheque for liquidated damages, etc shall loose its sanctity.
However the Bond and receipt issued for security cheque should be examined.
The companies are known to draft one sided/lop sided agreements and might have inserted that even in case of termination due to dissatisfactory performance employee shall have to pay the penalty inserted In Bond and based on such statement it may bank the cheque or raise demand.
The termination is due to alleged dissatisfactory performance and not on any misconduct hence company should tender notice pay.
You should show all docs on record starting from job advt,job application, interview call letter, offer letter, selection letter, appointment letter, all rules and policies mentioned in appointment letter,Bond, demand for security cheque and receipt, termination order, etc to an able Labor Law Consultant/Service Matters lawyer/Law Firm and give inputs in person. The counsel that has examined all docs and inputs can advise you the best.
Do you have copy of the Bond?
Were you employed before joining this company?
Were you asked to resign from employment?
Was the appointment letter issued on 1st day of joining?
Was the Bond place before you before appointment letter was issued?
What was the ground for creating Bond say some certified training?