Debit orders after canceling car insurance policy

I'm fuming with anger. I took up a car insurance policy with Miway last month around the 21st. I then decided to cancel after 2 days as l got a better premium somewhere, I did this through their website. Fast foward to the 17th this month, l get a message from my bank that Miway has debited my account. I immediately called their call centre to find out what's going on as l don't have a policy with them. The guy told me it's been fixed, l can go and reverse the money. Then another debit order went through after 4 days as l had no money in my account. I call the call center again and as expected l got no useful help. Today on the 29th l get another message that my account has been debited again by the same company. You people are ******* and this is unacceptable! I have incurred a lot of bank charges because of your incompetence and greediness. I want you to fix this immediately. Your call centre is completely useless. They keep on telling me the same thing over and over again when l call in. I want this issue fixed and this ******* debit order canceled for good.