Capital One calling family members! what to do?

OK, I am the sole owner of both accounts with Capital One. They are about 120 days overdue and about to charge off. I'd been getting more calls from Capital One with area code 559 and even a 714 but they still lv messages to call the 18009556600. To date , it has been useless to discuss settlement with them although I did get one at about 35 percent but they wouldnt send me a letter of settlement. Instead the cap One rep told me to pay a disclosed amount and when the debt is paid in full then will I get a letter stating Settled. I wanted the settlement offer in writing and the Capital One rep wouldnt give me one so I didnt agree to the terms.

Today, this eveing they contacted my father and told him I owed $XXXXXX. It is unclear whether the cap One rep asked him to pay my debt. Isn't this illegal? He is not even a cosigner on the credit cards!!!! Finding this out makes me wonder what else capital One has tried to do under questonable practices.