Ctrack charges after you have cancelled

Today I contacted Ctrack to cancel my tracker as I sold my vehicle. I was then told that another payment will still be deducted from my account as they have a one month notice period.

Why would you force a client to pay another month for a service that they have cancelled? You literally cannot deliver the service to me for another month but you expect me to pay for it?

Do you expect your clients to give you one month notice every time they plan to sell their vehicle? More specifically, do you believe that I will install a Ctrack device in my new car?