Are there any bill collectors on reddit who can tell me how to stop calls about my ex wife? details inside.

I have been divorced for over 15 years and bill collectors have started calling me for my ex wives debts. These are debts accrued after we were divorced. I have told them that we are no longer married and I have no number for her (My phone number I have now is not the same as when we were married...in fact she has never been associated with my current phone number) they just keep calling and are very rude to my current wife. Is there some way to stop these harassing calls? How did they even get my current phone number and why are they calling me for her debts? I am so frustrated do not know where to turn. Thank you