It is Commonwealth Financial Systems. They use many phone numbers to try and trick consumers into answering the phone. They are well known for buying "bad debt" and then pursuing collections on that debt even if: the debt is not valid and/or the debt is beyond the SOL for collections.
This is their website: http://necredit.com/
Report them to the Consumer Financial Protection Bureau. The more complaints that are received about Commonwealth Financial Systems the sooner they will revise their business practices and not violate the law!
http://www.consumerfinance.gov/complaint/
Consumer Financial Protection Bureau
Call me all the time and it's with a different number ever time I am a senior citizens and I am not working I'm not even drawing social security I want the phone calls to stop I'm tired of being stress out with these phone calls everyday early in the morning until late at night till 9:00 pm