Worse service and it has costed me money

Dial direct did a policy review on my car insurance policy and my premiums and access increased. So I did a comparison quote and got a better cover, that was about 3 months ago. So I called and cancel my cover with them, month end they attempted to debit but the weren’t enough funds and also mid month they tried. And again I called them questioning these debits and the supervisor whom I was transferred to said the policy was cancelled. And to my surprise today, dial direct debit from my account. The policy was cancelled twice and I do have the letter of cancellation, but yet this… This company has lot of *********** individuals, because now I have this short fall on my budget, because of dial direct ridiculous service.