VODACOM WORST SERVICE

On the 16/03/2015 i was using my data .when i had finished downloading and had finished using the net i check the data balance on my phone by dial *111# ,i saw that i still had 5.40mb left and R0.00 airtime .I was then very upset because i had R120 airtime before using the net.When i called 082111 @ 9:55pm the guy did not know why so he transferred me to Patarnie Vodacom customer service.She told me that when downloading it uses up the airtime for big files instead of data.I told her that it did not make sense and that vodacom is *****ing from the customer because data should be used first and then airtime.She said she cannot help me any more and that i need to contact there help desk.She did not even escalate the matter ( being a customer care help desk )she just told me to contact the vodacom help desk. I would not advise anyone to use vodacom as the service is SHOCKINGLY BAD.