NAL; Ask your wife if in past she had given her father any signed blank cheques
If yes, then that would explain the RTGS transaction;
If not, then register complaint with HDFC as to how this transaction was authorised.
Like other users suggested, do a re KYC as well with new contact info and also update a newer signature
With regard to 80L+ transaction reporting, consult your CA because there are high chances of notice from IT dept in future if your wifeโs IT returns are not adequate.
Also fetch the latest CIBIL report of your wife to check for any other existing loans in her name that you may not be aware of.