Made the mistake of replying to a piece of spam advertising meds online. It was supposed to have been for my roommate who has fibromyalgia. I never received the prescription and all I got for my trouble is telemarketing calls from an outfit in the San Francisco area two years after responding to the ad.
I received a call tonight while I was out from this number. At http://www.whitepages.com/search/ReversePhone?site_id=10583&full_phone=925+524-3415 it only says it's a landline in Clayton, CA. The only hint I can offer is we receive many calls from a drug sales company based in India on both our land and cell phones, in spite of repeated requests to put us on the Do Not Call list. They go through US based phone lines and use many numbers. This latest call could be from them. I'll watch for another call and see if I can find out more and report back.