********** by Cell C with my airtime

I loaded airtime of R280 and received 500 free data cause am on the supercharge tarrif. Within a few minutes all the data and airtime were finished without a warning or whatsoever. Normally when I am left with 15 megabits Cell C sends me an sms as a warning so that I can load data but this time they didn't. I called customer care and the agent said it's because it's a free benefit and to me it's a lousy excuse and very new to my ears. I want my airtime back or else I will be porting to Telkom mobile with immediate effect. I will cancelling my contract as well with Cell C should my complaint not be addressed as I expect. Anyone from Telkom mobile can call me within 48 hours should cell C not resolve this matter in the time stipulated. This is pathetic and a ******* ?? I am with Cell C cause of their data is reasonable for me although the network sucks bit to be ********** this way, I won't be taking this lightly, no ways. Cell C better sort this out or they will be losing me as a customer and every other friend and family if mine that started using the network cause I asked them so that I can call them with my free minutes that I get each time I recharge. I never give you guys problems especially with my contract now why am I being ********** this way?