Double charged

Due to unforseen circumstances i had to move to a new residence at short notice. I arranged for my line to be moved but was told that i need to cancel my existing line and reapply for the new line, which is idiotic seeing as the only change was adress, the isp stayed the same as well as the service provider. I received a invoice like i usually do each month and i paid like i do each month. I moved into the new residence only to be billed again. So basically i paid for fiber at the old residence for october but i cant use it as i am not staying there, now you want me to pay again for october at the new adress. My line has been disconnected, i will not pay for something i am not using. Sort out your **** or i will go to another provider, they are popping up like mushrooms!