Ted here from Shopify, thanks for reaching out to us!
Going by that screenshot, it looks like your payment method is not accepting the charge/the invoice has not been charged successfully and so your store has frozen (a store can freeze if there's been 3 or more failed payment attempts). Can you remember if there was an owed invoice from last month? I'd recommend using a different payment method or if you are using Paypal, make sure to have enough funds in the account for Novembers invoice.
Please let me know how this goes!