mutiple alerts on my calendar- says virus alert or system notification, etc

I am getting mutiple alerts. They say: You are exposed online, Get apple news for free, Virus alert - check protection, System notification, and clear your phone. I know they are spam, but I am having trouble figuring out how to get rid of them.

I found some discussion boards that said to log on to my iCloud and let Apple support know they are spam - but when I pulled my calendar up on my computer, it shows NONE of the alerts that my phone calendar shows! Soooo - that tells me it is just on my phone.

Does anyone know how to fix this?

I share a family calendar with my son, haven't remembered to ask him if he is getting the alerts too.