Debit order, charge without invoice and call centr

I changed my my bank details with Vodacom but Vodacom tried to take the money from my old account. I paid the account on 2015/02/24. I now have a charge on the statement of R 100 with no invoice, presumably for the returned debit order. I then called the call center and hung on for 1 hr before being cut off. I called back and complained about the wait and an explanation. I was then cut off. On the customer service the rating was 0 and 0