Very BAD service

On friday 19/06/2015 I tried to phone MiWay insurance to cancel my vehicle's insurance with them as the car is sold and no longer in my possesion. After holding on forever I tried their online chat service which first told mr I no 1 in the que and after awhile said could not locate server. Tried the chat service again, said I'm no 2 in the que and same thing happened. Then I left two call back requests and they only phoned back Monday 22/06/2015. By this time I wanted to cancel my whole policy, the lady told me she will tell the cancelation dept to call me. Still waiting. At 09h40 I phoned again and another lady said she will put me through, I said I want to speak to someone now not wait for call back, she then handed me over to a very arrogant senior advisor. I'm still waiting for the cancelations department to contact me. This is the worst service I've ever recieved from a insurance company. I need to get this policy cancelled before the end of the month to prevent the debit order from going off. I'm at my wits end as I don't know who to phone any more