They say my number is removed yet they keep calling.

Its a scam. They want all of your personal information before even telling you the name of the company. They tried to tell me I owed a debt, when I filed for bankruptcy and all of my debts have been cleared. When I advised them they need to speak to my lawyer they said good luck in court and hung up.

Yes, attempting to collect a debt that was discharged is illegal.

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