I'm sorry that you've had such a difficult time getting in touch with our billing department. Our chat line has limited billing information for account security, but you can find the Billing Deparment's direct phone-numbers here. I'm sure that they will be able to assist you.
Thank you for reaching out to the Community! For the security of your account, we are not able to discuss your billing in the Community and you will need to call our Billing team directly so they can investigate further!