"Harassing calls from "The Diabetes Center"

For the last few days we g0have been getting calls from "The Diabetes Center" (no location provided, caller hangs up when asked) asking invasive medical questions I decline to answer, asking for strangers who share oyr last name but are not related to anyone here. We get 2-5 calls per hour for 10-12 hrs a day. We have asked then to take our number off list, to stop calling. They don't. We have asked to speak to a supervisor. They hang up. It's not a robo-call, it's live people harassing us, sometimes saying very rude things, over & over. It's malicious. Probably sound silly, right, but it's becoming torture & affecting our health. If we change our number, we'd lose precious connections to friends & family who cannot be notified.