Terrible Service

I have been with Absa Idirect for 4 years and had no complaints. As soon as I changed my car and updated my details, all hell broke loose. They were sending me the incorrect details on the updated policy about 3 or 4 times. Finally when I thought everything was sorted they debited the incorrect amount. Then I just couldn't reach them. I have been attempting to reach them for the past month. Emailed and called, no response. Which makes me wonder what would happen if I was in an accident (God forbid), where would I find them? Also, how do I then cancel my policy if i can't find them? This is *********.