Protection1 Protectionone takes money out of checking account, even after cancellation , Internet

{A}  I verbally canceled Protection1 Alarm service.  Protection1 stopped for (one month) taking auto payments out of checking account. (House was sold, so no service was being rendered.)  Protection1 demanded payment for months of service after house was sold and forced payments out of checking account.  I spoke with them Protection1, Protection1 decided to settle for a certain amount of money; then, Protection1 took a larger amount of money out of checking account.  {B}  I should never have allowed Protection1 access to auto-payments from checking account.  I was going to install Protection One alarm service in my new home...I will never use Protection1 again.