Received calls claiming I owed money and they would be filing fraud charges if I didn't pay...

If you KNOW you owe no money, or believe the call was from a fake debt collector, please take the time to read this:
http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors

5/19/14 - 9:49 am - 7206368244. CID reads Recovery State. Female voice on recorded message, "this is recovery state solutions.  We are handling a claim in our office that you may be involved in. Please contact our office at 720-636-8244.  Thank you and have a great day."  Reported to DNC.

also calls from 7206368243 same deal wont send anything in writing

Same #, same woman claims I am involved in a case. I have Virgin Mobile. I wonder if people from other carriers such as Verizon, get the same calls. I have been getting a lot of these calls since I got thephone and have saved most of the phone #s.