Astonishingly Bad Service

I took out short term insurance through Liberty. On reviewing my policy, I noted some "red flags" which I wanted to raise with Liberty. I have, however, for months being trying to contact them without avail. On calling today, I was put on "mute" and after 12 minutes, my call was cut putting me through to "rate" the service received.

I would like my policy cancelled but how does one do that when it takes months to get through, then alas when you do, the call centre service agent promptly mutes your call and then just drops it.