Vodacom abuses the small man!

I have two numbers listed with Vodacom. I have been using every means at my disposal since October 2020 to cancel using the system Vodacom offers to no avail. I have used their *** request number so often over the months without result. It promises to send an sms (which it does!) followed by an official email cancelling within 48 hours (that it does not!). I have spoken to staff & had the promises again & again......not once have i received an email confirming cancellation of the number. Its now May 2021 & my latest invoice reflects BOTH numbers still with my being charged for BOTH! So as a customer/consumer/small individual how do i fight Vodacom? The law in South Africa stands on the side of the proponent that can afford the best attorney. Don't try & tell me otherwise! It is typical Vodacom arrogance in the new era of 'we are a corporate in the new South Africa & you are the customer - shut up & be thankful we consider servicing the likes of you at all!'