what is bar data add on ????

I accidentally turned on this feature a few weeks ago. My internet suddenly stopped working. When i try to turn the feature off there is no way of doing so.. On the App OR the website. When i reached into customer support and told them about the situation. They asked my why i would like to turn off the feature. They didn't want to turn it off. When I asked them to explain what he feature did they didn't answer but asked me to do some trouble shooting with my iPad. I honestly wish i was making this up. 3 weeks later I found out the feature BLOCK all data usage. This is the only thing I pay for service with my iPad for. I kind of understand why you might want the option to do this but the fact that you can't turn it off with out calling in is absolutely absurd.Especially since the first time i did it they didn't want to help me with this at all. I am extremely frustrated.