AXXESS DSL poor service

We have ordered a fiber deal from them over the phone and the consultant informed us that all the fees will only be payable when they come to install the fiber and router. We then received in invoice from them stating that the amounts need to be settled before they will be able to install and set up the fiber package. We then queried the matter and the consultant apologized for what her colleague said and confirmed that the invoice must be paid before they will be able to come and install the router and fiber. I then requested that they send me some sort of confirmation that states what we will be paying on a monthly basis, and the consultant said that they do not send confirmations like that. I would just like to receive some sort of proof or confirmation of the billing amount will be monthly before I pay the invoice...