Paying for a tracking service for a vehicle that has been written off

My mother took out a tracking service (policy no. ***) offered by the service provider when she bought her vehicle a couple of year ago (more than 3 years ago). for this service she had been paying an amount of around R198 per month.

Unfortunately, on the 01 of June 2020, she was involved in an horrific accident whilst she was on her way to her place of employment, the accident of which rendered the vehicle a write off during the same month.

We had then instituted a process to cancel the service during the month of July 2020, and to date the entity is still deducting the monthly premiums for a service relating to a car that has been written off.

She then made contact with them, and she was informed that another debit will go off at the end of December 2020, and in all honesty, we are unsure why this is the case, cause the benefit she enjoyed whilst the car was still in her possession is no longer being enjoyed, as the car has been written off.