Same here. Leaves no message and when I call back it says not available. I looked up a little - google says it comes from a landline in Katy, Texas I'm blocking it
They have now called me three times and the third time someone was actually on the line and the woman said she was with Memorial Pharmacy (I believe) and they call all of their pharmacy patients to help them save money on their diabetic supplies. I asked her where she got the information that I am diabetic (because I'm not) and she was like "oh, are not diabetic ma'am?" I said no and she apologized and we hung up. Just your typical phishing/scam crap.