I have recently been contacted by several people who have had dealings with this company. As far as I can tell, Regional Arbitration Services is not an arbitration company at all, but rather a debt collection agency. I have never heard them use the words debt collector, but they sure do have fancy titles. They refused to talk to me for one of my clients.
So, I went online. I found this and this and this without even doing much checking. They used to be called District Restitution Service. It appears to be a company out of Canada with offices in Colorado, New York, Las Vegas and Salt Lake City. They also use landlines that seem to be based in California, including the 415 and 916 area codes.
The calls I am receiving deal with people who are being told they are being arrested or referred to the district attorney. This is a violation of the Fair Debt Collection Practices Act and the California Rosenthal Act. No one can threaten to arrest you for not paying a debt. Both the FDCPA and the Rosenthal Act make this clear.
If you receive a call from these folks, you should immediately talk to an attorney.