Random FaceTime Calls with multiple numbers

Help! I keep getting random FaceTime calls with multiple unknown numbers over and over. If you answer, you get disconnected but regardless they call over and over. I’ve tried to block the numbers but I keep getting the calls. The amount of phone numbers In the group increases. It’s so frustrating! How do I make it stop. I turned off FaceTime, I like to have that when I talk to family. What do I do! It’s like Spam calls gone wild!