You can reactivate account if:
Follow the troubleshoot steps. However, if your Box account was created before your email could receive inbound mail, your email was likely placed on email suppression list as a result of a hard bounce.
Box.com accepts credit card, ACH, wire, check and direct debit where available. Please use the payment method outlined in your contract.
If you pay by credit card, receipts are automatically emailed to the "Bill To" address they have on file. If you use another method of payment, Box.com will email your invoice prior to the due date outlined in your contract.
Also, you can visit Box.com Official Website to get more helps, faqs and knowledge base.
A Cloud Content Platform for the Digital Age
Box is an enterprise content management platform that solves simple and complex challenges, from sharing and accessing files on mobile devices to sophisticated business processes like data governance and retention.
Since 2005, Box has made it easier for people to securely share ideas, collaborate and get work done faster. Today, more than 41 million users and 85,000 businesses—including 69% of the Fortune 500—trust Box to manage content in the cloud.