1. Unilateral service bonds are not legal.
2. What does the terms of appointment say?.
3. Do you have the previous employer's demand letter addressed to you to pay Rs.2 Lakhs to the employer.
4. Did you pay Rs.70,000/- to the employer by way of cheque or cash.
5. If there were to be any Technical/Specialized training imparted to you during the course of employment and if you submit resignation before the minimum tenure period, then the employer will have the right to enforce money bond, since the employer would have spent lot of money for the training of the employee. Please let me know, whether you underwent any specialized training in India or abroad.
6.It is the general rule that the employer should not keep an unwilling employee on its roll, except where the employer as well as the employee have mutually agreed and there is a written document for it.
7.Send a legal notice to the employer, through a lawyer, and inform the employer that you are going to take legal action against the employer if your Rs.70,000/- is not refunded to you immediately.