Charging out of bundle rates when i have data

I received my monthly comntracted airtime today, but I still bought pay as you go airtime above it in order to buy data bundles. <br> <br> A couple of hours later, I'm checking my balance and I have lost close to R30 airtime, but still have data available, so they were charging my airtime for all my browsing as well as my data. How does this make any sense???! <br> <br> I have tried calling customer service a few times and after having my call discarded twice, they eventually tell me that my account has been disabled due to unpaid balances... What??! How then am I able to use my \disabled"phone"