While we wouldn't have a way to access or monitor your My Best Buy Credit Card account, I would encourage you to reach out to Citibank, the financial institution for the My Best Buy Credit Card, to discuss the issues that you are running into when trying to access the account. You can connect with Citi's technical support line at (888) 738-4624. You can pay your credit card bill by cash or check in any Best Buy store. You also can pay online, by phone, or by mail. For the uninitiated, the Best Buy credit card has some attractive features If you want to pay your Best Buy credit card bills online, first log in to your Bestbuy.accountonline.com payment portal. To login to your personal account, you have to provide your registered Password and User ID. During the registration process, you would have entered your credit card, personal and bank details.