Alluri Welcome to the community!
I am happy to answer your question as follows:
The credit for the activation has been added and will be shown on your next invoice.
The first invoice will always be sent by mail, unless you have made any adjustments to the invoice delivery before it is sent. Since you want the invoice to be sent by email, the next invoice will be sent to you by email. If you wish to pay your invoices via e-banking, you must register this in your e-banking.