Remove Payment information from AVG account

Hello Katia.
Thank you for contacting AVG.
We apologize for the inconvenience caused to you.
We have a specialized billing team, who'll give better clarity regarding this concern.
Please use the below link to contact them :
https://support.avg.com/support_sales_chat?formType=sales
Please feel free to reach us again if you need any other help with AVG.
We appericate your understanding.

I am trying to update (in fact remove) my credit card information from my AVG account, but when I click on "Update" in my Payments Center the system pops-up the error "Sorry, there’s been a glitch - Please try again later. If the problem continues, contact support." 
It has been happening since yesterday, when I tried first.

Does anyone know how to resolve it ?

Hello Katia.
Thank you for contacting AVG.
We apologize for the inconvenience caused to you.
We have a specialized billing team, who'll give better clarity regarding this concern.
Please use the below link to contact them :
https://support.avg.com/support_sales_chat?formType=sales
Please feel free to reach us again if you need any other help with AVG.
We appericate your understanding.