Claim of dues from recovery Agent via Advocate email

Today I got an email from an advocate saying that a Legal Notice u/s 406, 420, 422 of Indian Penal Code will be issued against me on behalf of his client who is a recovery Agent and to whom Standard Chartered Bank has transferred my credit card liability on 2010. The liability which I am asked to clear is nearly 2cr. As far as I remember, this credit card due was somewhere 25,000/-Rs and that too in the year somewhere between [deleted]. I do not have any details or correspondence in this matter as I was young and it was handled by my father who is deceased.Today suddenly I was shocked to receive this email. I do not know what to reply and how will I pay such absurd amount and deal if they file such case and initiate criminal case on me. Plus I don't know any details as it is a very old matter. And since then this is the first correspondence I have received in 20 years. This recovery Agent and his advocate has also sent this letter today I e 11/05/2021 and that too after this debt was transferred to them in 2010. Please advise as I am very perturbed.