Access problems to my service page to download the invoice

Hi,

I have some problems logging into the service page.

When I try to log in the page asks for the INVOICE number to check my identity but I'm logging in because I've paid the invoice but I did not recive it.

How can I unlock my service page? Or where can I look for the invoice? (I've already checked the email account associated with it).

The ITALIAN page for help keeps responding with 404 pages and the chat bot can't seem to connect to an operator.

Thank you for your help.

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