The identified name was 'Mr Taylor' from 'Unified Processing Services' - which is apparently a debt collection agency. Called their 800 number (888-419-7301) to inform them they've got the wrong number (I have no outstanding debt at all) and they requested ID verification, including social security number, refusing to remove this number, or transfer the call to a supervisor until I provided it. Hung up on them.
They need to be reported. As far as all my research online goes, they are not a real debt collection agency, and complaints aren't legally handled this way.
Well then I suggest you report them. No one can or will do it for you.
Federal law (FDCPA) requires them to send you a letter (US MAIL ONLY) postmarked within 5 days of their first contact that contains their name, physical address, the creditor’s name, and the amount of the alleged debt. It also must contains “mini-Miranda” telling you that it is an attempt to collect a debt and that all information will be used for those purposes. The one other important thing that this letter must also have in it is that you have a right to dispute the debt within 30 days of receipt of the letter and if you do so, all collection activity must be stopped until the debt is verified.
Read up on your rights here and also make a complaint at this government site: http://www.consumerfinance.gov/
Also file a complaint with your State Attorney General's office.
List of State AG’s offices: http://800notes.com/faq/attorney-general