cancellation of Wifi

On the 28/11/2025 i wrote a notice informing Vukela that we are vacating the rental premises end of December 2025. I also followed it up with a call, they advised that i must sent that email to cancellations at Fibrestream. To my surprise end of January they send a statement that i owe for January WIFI, i told them i owe nothing as i have cancelled the services, Zanele also called and i told her the same story. it's now March they are still trying to deduct my money even though i cancelled and when you call, they promise to call you back but they don't, this is evident that they want money for the service that we are no longer using and i also cancelled the debit order. Vukela and Fibrestream please do better, why is it so difficult to cancel the contract