Really Bad Service

I have been trying to get hold of someone at King Price insurance since last month regarding my policy to cancel it as i don't have a car anymore. My first email was sent out on the 26 September 2018 - no response or feedback, second email was 27 September 2018 - once again no response or feedback. Then i went on to there website and requested a 'call me back'.......still no one called but on the 1 October 2018 they sent me and email saying - 'We tried, and tried, and tried to call you..... But we missed you.' witch no one called me. Then i did the same thing again on there website, eventually someone called me and ask if they can help me and i told them i want to cancel my policy, the lady on the other side of the phone said to me 'i will get someone from that department to contact you'. Well once again no one phoned me and once again on the 10 October 2018 they sent me an email saying - 'We tried, and tried, and tried to call you..... But we missed you.' witch no one called me. So i stopped the debit order, reason being i don't have a car and wanted to cancel my policy but not getting any help from them but still King Price has tried to debit me twice now already. I really hope this works and some can assist me.