Monthly statements

I have a contract with autopage and I have requested that I be sent my invoice/statement on a monthly basis via e-mail or post, to date I do not received an invoice or statement to either of the channels, I only receive an sms a day before the phone is going to be suspended and also I need the statements for my work as they pay for my bill. I have to always call them for a statement every month and that is increasing my admin and increasing my phone bill.