For most customers, they can manage their billing preference (change credit cards), add new licenses, or change their subscription preferences online. If you are the billing admin of the account, have you checked to see if you can update yourself?
FAQ reference: https://support.goto.com/meeting/help/billing-center-faqs
@webinarfbk I'm sorry we don't have native Russian support right now. If you cannot dial into support and need billing assistance, please click my Community name to send a private message with your account and contact info for a direct follow up.