Generically speaking there can not be a security deposit for employing an employee by employer.
The training provided by employer should be such that adds some qualification, some extra ordinary skill to employee and hence the demand of signing some BOND.
The training…………………….so called training………………………….if it is given to mange the counters of employer then employer has to arrange it without any cost to employee.
The late payment of wages, non payment of wages by employer is breach by employer and is a justified reason for resignation and notice period/pay and even BOND should loose its sanctity.
The querist is undoubtedly with one unscrupulous employer and a high headed too that has resorted to termination to exercise undue pressure on employee……………………….instead of begging apology for delayed and non payment of earned wages.
The querist is of course ill informed of his rights, law and is certainly not a member of employees unions, trade unions and has not consulted elders in the family, a lawyer.
As advised by Mr. Kalaiselvan without wasting time you may approach a competent and experienced labor consultant/service lawyer along with elders in the family, and show all docs on record in person.
If acceptable to you then you may attach copies of so called bond, appointment letter etc.
You may erase the names etc to maintain the confidentiality.