Impossible to cancel my landline

<p> </p> <p>I tried to cancel my landline in January 2017 and I am still trying. It is now the end of April. I have sent 4 emails in this time and have been contacted only once with "further instructions". I comp**** with these instructions, but no news since then - that was in February.</p> <p> </p> <p>Today (29 April 2017) I decided to try and email again, but when I did, I received a notification saying that the mail box to which you send your cancellation requests is full. This is becoming quite the joke.</p> <p> </p> <p>There should be a law governing turnaround times when a consumer wants to cancel a service. This is incredibly poor service and they expect me to still pay them.</p>