You need to request this via an Agent. You can open a ticket in order do so!
How this works is Teksavvy mails your invoice 20 days in advance to be paid. The payment is made via an Bank Account or Credit Card as per normal. Also note it is still important to check your Digital invoices or MySavvy portal balance online. As if there are delays or losses in the mail system we do want to avoid possible late notices when possible.