Hey there @webuser20,
It sounds like you're on classic Web Hosting, which only goes up to PHP 5.6. If you need PHP 7.0+, then you'll need to upgrade your hosting to the newer version of cPanel.
Easiest thing to do here is give support a call, let them know you need to be on PHP 7.0+, and let them know it's a business need.
Once your issue is resolved,
please be sure to come back and click accept for the solution