is anyone else getting calls saying their Icloud account has been hacked, about twenty times a day?

Unfortunately those calls are prolific, and persistent. Since you recognize that they are not valid, you can block the number(s) using the advice listed in Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support.

I have personally experienced those calls. After a day or two of blocking the various numbers used, they eventually give up.