Unbelievable that it is impossible to get an invoice/receipt, and that nobody is answering the question!

For example Servage send automatically invoice/receipt to email, and you can go anytime to print it from the control panel. Also you can easily see how long your subscription is active etc...

I upgraded the account to professional, but at any stage there was no receipt/invoice that I could print. Neither via email received one. How can I get one, as I need it for my personal accounting.