Can a employee of a bank call a family member and tell them personal financial information trying to collect on a loan you have

I have been late several times(not 30 days)on my car note.A man at the bank has called my mother and asked(and gotten)for a payment.I found out and told him to never call her again. Since then I found out he has called her again telling her he was going to repo my car if he did not get a payment although it was still less than 30 days late. I am 50 yrs old and my mother is in her mid 70's and does not need this type of harrassment. What can I do to make him stop and do I have cause for a law suit? Thank you