VWFS account portal broken. Management does nothing to fix it

Unable to access my loan account via the VWFS portal. The issue is to do with the portal and not my account or browser. It occurs after I click on “manage acc” > “access vw acc services” > “login” > error occurs. Sent an email to inform them. Nothing was done. After a week I called and spoke to a Manager. Still nothing has been done after another week. Surely as a financial services provider it is their obligation to provide a fully functional portal for their clients to access their account at all times.