I tried to log a fault with Eir yesterday but when I clicked on "Report a fault" on their support page, I got the following screen error message:
Our Log a fault form is currently unavailable
Our log a fault form is currently unavailable. If you would like to report a fault, please call us on 1901.
The Eir Log a fault form is still unavailable today (16-Mar-2021). That is one way to avoid having a backlog of Customer issues to resolve.
There is no support email address provided by Eir, where an email could be sent to clearly describe a fault, with attachments of relevant screen snapshots, error messages, etc.
The Eir "Support" is obviously designed to stop Customer communicating problems to their support team. If people are not willing to wait hours for some support person to answer the phone, then their frustrated Customers (the ones who provide the money to pay their salaries), will not bother them.