Vodacom the worst

I have received the worst possible service from vodacom. Being a customer for over 10 years

I have been paying my vodacom account via the vodapay app for years. Last year all of a sudden they stated debiting an old bank account that I no longer use. This cause multiple unpaid debit orders. I called in they advised me that I need to go to a store to have a debit order removed. I logged a complaint which I never received feedback on. Last month I call in to vodacom to make an arrangement on my account. Which I was advised was done. This month I notice 3 debit orders going from my old bank account and I am all of a sudden receiving collection letters. I call in to log a complaint and get this sorted. I was advised I will get a manager call back and to this day nothing. The agent I spoke to just dropped the line. Yesterday I decide to go to a vodacom store to get this sorted and they Inform me that I need to call in to get this done. I would love to know what is happening with vodacom and what is happening with my account. Why are you debiting an old bank account I no longer use. Who is now going to have to pay this account that is also in debt due to the unpaid debit orders