I recieved an email stating that I was using a theme which I did not have a license for and that if I didn’t purchase the rights then my page would be taken down. A couple of days after receiving the messege, I couldn’t access my page. Not sure what to do.
Hello @HerbieMedina 
I think you should check the sender of the email. If you can confirm the email is from the theme vendor, then send them an email to arrange this.
Hello, @HerbieMedina .
Shopify does require the use of a licensed theme only, as per our Terms of services. If an unlicensed theme has been used, then removal and/or freezing of account access would be expected behavior.
My advice in this case would be to reply to the email you received to await a reply from the relevant team. They will be best positioned to help you with the next steps, thank you!
Yes, so it is best to purchase a valid theme or switch to a free theme. Then reply to the email to let them know and reopen your store.