There is this account that hacked into my calendar and is giving me fake links that say your information is exposed to everyone click here to fix it and then there is a link. I’m not pressing it. What should I do?

The problem that you describe is likely very easy to resolve.

It is highly probable that an inadvertent click on a website link has “subscribed” an additional (unwanted) Calendar to your device - and this unexpected Calendar is exposing unwanted calendar events and sending you unexpected “adverts” or other warnings. 

You need to check for what’s out of place...

iOS/iPadOS13 and earlier: Settings > Passwords and Accounts

iOS/iPadOS14: Settings > Calendar > Accounts

Look for an “account” that shouldn’t be in the list of accounts - as this will likely include the Calendar that contains all the unwanted events. When you find the suspect account, tap - then select Delete Account. This should resolve the problem in its entirety.

I hope you find this helpful in finding the source - and in resolving the issue if an unexpected Calendar is found.

Open Calendar App from the Home screen.

Next, tap the Calendars button at the bottom.

You should now notice a section called On My iPhone with several suspicious calendars listed below it. ...

Tap on the i button next to the suspicious calendar.

Now, tap on Delete Calendar.

No one hacked your calendar its just that you once opended a link and it accesed your calendar its called rogue notifications to remove it go to settings, passwords and then you will see a unusual link remove it and it should go.