Tracker debiting account of vehicle sold after communicating that the vehicle should be removed

Called tracker on the 14 January 2021 to inform them of the passing of my late father, informed them that I have sold one of the two vehicles that have trackers and wish to have the tracker discontinued on the vehicle that was sold.

I was informed that I need to email a copy of death certificate to ***.

As soon as I received the death certificate I sent the email on the 05-02-2021 to the above mentioned email address and received no feedback.

I then called on the 26-03-2021 spoke an agent and was advised that I foward the mail sent on the 05-02-2021 to him directly of which I did.

I didn't receive any feedback and decided to send another mail 06-04-2021 requesting feedback.

Till date I have not received feedback but the account is being debited every month for the past 7 months.