Hopeless with uncaring attitude of Vodacom customer care

I have been attempting to cancel an entertainment subscription for the past two months without success. Each time I call, I am assured that my deregistration is processed, yet the charges continue to appear on my account. During my initial call, the agent refused to provide a reference number and instead gave me her personal number. On my most recent call, I finally received a reference number and was promised both a successful deregistration and a refund. However, the charges persist on my statement, and I am now blocked from contacting customer care by phone. I have been directed to use their automated WhatsApp and Tobi services, but neither is functioning.