Worst business and biggest ****mers

I was with Miway Insurance for many years, when I cancelled my insurance I canceled everything which was accepted, I then received correspondence in July (months after I cancelled with Miway?) from Netstar to say they will debit my account. I then emailed and advised that I cancelled everything and that they should cancel on their side with immediate effect and that I do not give them permission to debit on my account, the same email was then sent again in August and then again in November. I have been debited since then monthly putting my bank account in the minus and I then I get an email this morning to say they will hand me over. I am sick and tired of this.