Vodacom Greed

I noticed that my monthly account was slightly higher than usual. I checked my online balance and it said that a international sms was sent. I don't no anybody outside SA and also rarely send sms's to begin with. I phoned customer care and explained the situation. They said that they can't help me because i don't have itemized billing. I must now pay just for them to check their mistake. I then asked if the problem was in fact on their side that they would then be willing to pay for that and they said no. So i must now pay R18 for them to check and then they will reimburse the R2 for the sms. I don't care that much about the R2, it is about the principle of them getting away with this. I have been a loyal customer at Voda for years and this is unacceptable. It costs them nothing just to quickly check but this is a clear example for how greedy Vodacom is with money.