Lack of updating system, causing inconvenience

My December fee was in arrears, made EFT payment on 13.01.2016. <br> 15.01.2016, the same amount was debited from my account.<br> <br> Did contact Cell C (***), told I needed to wait 2 working days to receive a call, and then wait another 7 days before MY MONEY can be refunded!!!<br> <br> Whose fault is it? now I have to be inconvenienced due to a double payment?<br> I am so angry and really upset at Cell C as I am a bread winner to my family.