iCloud Storage is Full; calendar events posted on every day

All of a sudden I have daily calendar events that say

”Your iCloud Storage is full. Receive 50 GB for Free”.

I have tried to decline but it keeps coming back. I think it is a phishing attempt. I dug into who sent it and it looks like my address but I finally found the email

Can you help me before this virus attacks my account?

I think it might be in my old email account from hotmail.

[Edited by Moderator]