Who called from 2537774789

Bottom feeder collection agency after an old debt from a business that closed years ago.  One of many numbers.  This one is now BLOCKED.

This caller keeps changing numbers their phone number (same caller, different number) and ask for two different people who do not live at this residence. The caller uses irritating screeches and then hangs up. I would like to sue them and will if someone can tell me how to do it. I am on the DoNotCall Registry.