Hello Viter,
Welcome to the community!
Firstly, you should note these forums are community-driven and not intended as a venue for customer services. We do not have access to customers' accounts so we would not know the reason for that balance. You might consider reviewing your bill for the details of that balance. You should be able to view your bill via your My Account --> My Bill. From there, you should also be able to Save and/or Print a PDF copy of your bill.
If you would like discuss your matter, you would need to contact customer service. In addition, they can also be contacted via Live Chat, Facebook, or Twitter. Those methods can be accessed via the contact page posted above.
Hope this helps 😀
Cheers
