Vodacom Terrible servive

After making a payment arrangement with Vodacom last week. Where the whole amount owed needs to be taken in two separate instalments. AND THEN...today the entire amount is debited. I spoke to a very unprofessional lady who gave me answer that she does not know how it happened.Really? If I tell one of clients that I don't know how a mistake was made I will loose all of them. And because of this my payment to another company defaulted. I told this lady this where her answer was that the amount would be put back in my account after 3 to 5 working days. This would not solve the problem. I then insisted in speaking to a manager, where she answered me in "sjoe", Put me through and as I waited the line went dead and that the number you have dialed does not exist. Terrible really terrible