State Bank Of India [SBI] — Harassment and threats to my family

I was sent a credit card from SBI about 14 years ago which I haven’t spent a rupee from. They used to call market some things like insurance etc which I didn’t want or consent to and somehow they charged me 5k that time, I was trying to dispute but due to moving away from the place I never got it it and even after so long they harassing my family and never providing the actual charges.

They have added all kinds of interests and they are now quoting ridiculous amounts to pay and never providing any proof of charges.

How to stop them permanently??