Please refund me my airtime money.

I am a prepaid user & my account is normally with a positive balance, to avoid I selected the option to purchase data on continuous basis directly form the Vodacom self help service. Since the inception of COVID I have been working of the wifi that gets supp**** to the complex in which I reside. I decided to cancel the service since I would no need to purchase the data, I called in to the customer-care line to cancel who assured me at the end of the call that service was cancelled. To my surprise that for the last 2 months I have billed for data purchases after specifically requesting a cancellation, to get hold of the operate at the call center is a nightmare they are not eager to assist in any way & just look to get you off the call as quickly as possible.