Double payment silence

I accidentally double-paid Vodacom last month because I thought the first payment did not go through. The double payments happened 4 days apart and were made with 2 different cards. My bank confirmed that 2 payments have been made. 5 calls to Vodacom, many promises later, when someone advised me to send the proof of payments to the pop department. Apparently, no humans work there because I sent the email twice and I have had not the slightest response. Vodacom clearly would rather pocket the money and ignore their customers. I suppose I will hear from them when I stop paying my account. It is one way to get attention that is otherwise lacking.