Being Charged even after the cancellation noticed

I clearly stated that I HAVE RELOCATED TO A PREMISES WITH NO FIBER AND MY SERVICES HAD TO BE CANCELLED and this was on 09/Oct/2019 at 12:59:59. I got an autoresponse with reference number: VOX***1. I was well aware that had to pay for October and November a 1 months calendar was required, however, I being charged for December as well.

Why can all their mechanisms be efficient and the cancellations services be exceptionally tedious? This is simply so as it is so by design.