Employment agreements with the negative covenant is valid and legally enforceable if the parties agree with their free consent i.e. without force, coercion, undue influence, misrepresentation and mistake. The courts in India have held in its various judgments that in the event of breach of contract by the employee, the employer shall be entitled to recover damages only if a considerable amount of money was spent on providing training or incurred other expenses for the employee.
The term "reasonable" is not defined under the legislation and, therefore, the meaning has to be determined on a case by case basis depending upon the issues involved and circumstances of the case. In general, the conditions stipulated in the contract should justify that it is necessary to safeguard the interest of the employer and to compensate the loss in the event of breach of contract. Further, the penalty or compulsory employment period stipulated in the contract should not be exorbitant to be considered as valid and to be regarded as reasonable.
In order to execute a valid employment bond, the parties have to ensure that the following requisites have been complied: (i) the agreement has to be signed by the parties with free consent; (ii) the conditions stipulated must be reasonable; and (iii) the conditions imposed on the employee must be proved to be necessary to safeguard the interests of the employer. Further, the employment bond stipulating conditions such as to serve the employer compulsorily for a specific time period or penalty for incurring the expenses is in the nature of the indemnity bond and, therefore, such kind of employment bond has to be executed on a stamp paper of appropriate value in order to be valid and enforceable.
Usually, the court determines the reasonable compensation amount by computing the actual loss incurred by the employer having regard to all circumstances of the case. Even if the bond stipulates payment of any penalty amount in the event of breach, it does not mean that the employer shall be entitled to receive the stipulated amount in full as compensation on the occurrence of such default; rather the employer shall be entitled only for reasonable compensation as determined by the court.
Therefore you can initiate legal steps in the event of the employer's demand for payment on the basis of employment bond is unreasonable.