Collection agency trying to recover very old debt

Thanks

Very rude woman asked me to verify my birthdate etc., I said if they were a legit business they would have everything on file.  Woman said they would call me back and I said don't bother and she slammed the phone down in my ear.  I would be very cautious, DO NOT GIVE ANY INFORMATION TO THEM.

they called me, and when I answered and said "Hello", they hung up. They call me at least 3 -4 times a day, every day and the same thing happens, I answer, they hang up.

It's PRA Group formally Aktiv Capital...debt collectors