Debt collectors are notoriously deaf to verbal requests and denials. If you're not their intended target, you must tell them in writing. It's called a "cease-comm" for short, and it is best sent USPS Certified with a return card. Under federal law they must comply with your written notice.

Learn how to exercise your FDCPA rights as an alleged debtor at FTC-dot-gov.
http://www.ftc.gov/os/statutes/fdcpajump.shtm

this collection agency keeps calling me and it is constant.  It is the wrong number as they ask for someone else. I keep telling them that it is the wrong number and they continue to call!

no one responded.