Received an e-mail from One Call wanting to sched...

Received an e-mail from One Call wanting to schedule your diagnostic procedure(s) which have already been approved by your insurance . This or these procedures were requested by your physician . (No doctor was named. Just your Physician ) All of my doctors do their own scheduling and none of them had ordered any procedures or diagnostic testing. My primary care doc suggested that it was a scam and to ignore it.
Out of curiosity, I Googled One Call Diagnostics and found them to be a real company, however, I still wonder how legitimate they are. After reading the reviews, I am also wondering if they have added scamming to their menu of services .
NONE of my doctors had requested any kind of scheduling services from this company. Now I am wondering how they got my name and email address. And to what purpose. When I tried to call them to attempt to obtain that information, I was put on hold forever. I never spoke to anyone.