Refunding

My upgrade tablet a huwaii was faulty and I contact Vodacom. They arrange to come and fetch the tablet at my work. What they did. I contact vodacom and asked them if I can continue with the upgrade. The provide me with a new device.

On 17th September 2018 I notice that Vodacom deducted R4171.00 from my account instead of R1643.00. I contact them and the guy inform me that he will send it through to the acounts devision so that they can refund me. They had to refund me with the amount of +R2700.00. On 24th September 2018 I contact vodacom again. I was informed that they did not receive a complain and nothing is send through to vodacoms account devision. They owe me R2700.00. The ref nr is 1- ********** ********** . On 2nd October 2018 O try again to get hold of vodacom but the phone only rings. Please help.