Does the mention of a bond on appointment letter count as a valid bond?

My appointment letter carries the following two lines: 1. If you want to leave employment within 1 years from the date of appointment, you should give 1 month prior notice and shall deposit 3 months gross salary before leaving the organization. 2. You shall undertake not to dispute the amount, and shall pay the amount, before requesting for formal relieving letter from the organization and at the same time organization has full right to initiate appropriate legal proceedings in case of breach of this employment agreement. However this was not communicated to me in my interview or after joining. Neither did I sign a separate bond. Employees hired after me are now being asked to sign a separate bond agreement. My question is - in my case - is there a bond since I have not signed a bond agreement? If the company has no proof of training - as they do not train newly recruited staff - then can they legally ask for compensation for breaking the bond? What are we expected to compensate? Thank you