Difficulties Buying Data after cellphone Upgrade

I upgraded my cellphone contract on the 26th of August.I then recharged with R160 airtime on the 27th and I have been trying to buy data without any luck.Each time I try I get an error message that I don't have enough airtym.I then called the ***and I spoke to a consultant named Khaya,who then transferred my call to customer service..He was very friendly and helpful.The lady he transferred me to told me to reboot my phone and try again,i did about 4 if not more times and I tried again,only to get the same error message.I called customer care again and spoke to someone else who cut me off midway through the conversation.i called again,and like the first time,i got cut off.I have been trying that number almost everyday and when I get to the option that allows me to speak to a consultant the line gets cut off.i know for a fact that the problem is not the phone im using.On Friday i went back to the store & left a message for Elsie.I then sent an email on Saturday & I got an email back that stated that I will get a response 48hours later,that was on Saturday and to date,i haven't received a call or sms.This is not the 1st time im not getting the service I deserve.IM ****ED