Unresponsive in cancellation of service requests.

I have a fibre service with Bitco which I am trying to cancel. The first mail was sent to them on 27 July requesting cancellation. I received an automated response on 28 July saying the ticket has been closed because they haven't received feedback from me. I then sent a mail back asking what information is required because I did not receive a request for information. I got no response. I sent a follow up mail on 5 August asking for acknowledgement of my request for cancellation and got no response. This morning (7 August) I called Bitco to cancel my service. The operator transferred me to the accounts department, That person then said he is going to transfer me to the cancellations department. When someone answered I asked if it is the cancellations department and he said no I need to call a different number. When I called the number it said the number is unavailable at this time. What do I need to do to cancel my service with Bitco because I am not getting much joy thus far?