BILLING me for services before the date of which i ordered the new line.

Ordered new line from VOX to be active 1 NOV. Clearly stating that i cancelled my old ISP and would like to use their services from 1 NOV. Openserve came to put the line in on 16 October. But VOX didnt deliver the router until later. Now this morning i get a bill for services from 17 Oct till 1 NOV. Why? Im still using the old ISP services until month end and i clearly ordered the line from 1 NOV. Why must i pay if i dont even use your line and i gave you a date of from when i want the services when i signed up. Also special on order a new openservice line and get R900 credit on your VOX account which i didnt receive. Send 3 emails already and not one reply regarding the accounts issue. Is this how VOX service is going to be then i see a problematic year for me. PLease contact me urgently regarding the credit that im supposed to get as i only ordered your services from 1 NOV and im not using it now at all.