Got the same call.  Let it go to voicemail but no message.

Same call. Went to voicemail.  They left no message.

Received call - caller listed as "Unknown".  Answered (only so I could block it without entering the number into my call blocker).  No one responded, but they won't dial back through on that number again!

I am getting a lot of calls from here no one says anything and you cannot call back through to them

I just answered a call from this number.  A gentleman with a very thick Indian accent, clearly trying to talk over a great deal of background noise from his coworkers, identified himself as "David" from "US Pharmacy".  He asked me if I remembered buying Viagra or Cialis.  I said that I do not remember making such a purchase.  He hung up.