I also got a call today, nobody answered. I called the number back and got a pre-recorded "thank you for calling, please wait while we transfer your call" message, after which all I heard was a bunch of scratchy noise for the next 1 to 2 minutes after which I hung up since nobody seemed to pick up.
I got no ladies with Eastern European accents, but since random people are getting called by this number, it may very well be a scam.
I got a call from this number and they didn't leave a vm and I'm not planning on calling them. I'm intrigued if it really is a bulgarian service, because I'm bulgarian and receive some calls from bulgaria on my phone so I wonder if they had some way of tracking that. I don't really list my number anywhere as far as I know. weird.