The reason you will have been asked to do this is because here at Ice comms, we cannot apply the discount directly to your network direct invoices.
Essentially the network will always bill you for the full price for your line rental however Ice comms actually credit this back to you.
By way of an example, if the salesman said you at the start of the contract, your line rental will be £100 a month but we will discount it down to £0, you will always pay the £100 to the network, however Ice comms pay this money to you in order for you to pay the network.
The reason for the requirement of an invoice is simply an accounting issue. When we get audited, we are legally required to provide evidence of where our payments have gone hence the need for an invoice.
The amount that we have asked you to invoice us for may not make sense to you but there is however a very simple reason for this. Because you are due a monthly rebate, we realise of course that the idea of you having to provide us with an invoice every month is time consuming and unnecessary so what we ask you to do is invoice us in full using one single invoice and then our accounts department then spread this out over monthly payments to you.