From India, Hyderabad

If you haven't signed the bond yet then you don't have to pay the bond amount of 5 lakhs. As your HR hasn't informed you about the bond before, they can't force you to sign it now.
If you have already signed the bond, then please take legal advice from a lawyer on how to proceed further.
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Regards,
Sairam Bandi
From India, Bengaluru