IPhone doesn't work when it's not connected to Wi-Fi?

I have an iPhone 5 and I went over on my data for this month, I payed for 2 gb of extra data, but for some reason if I'm not connected to Wi-Fi, nothing will load. I can still send txt messages and stuff but apps and Internet related things will load. Before I payed for the extra data I got a txt saying there would be no more data transfer because I'd used it all, but if I payed for more it should work right?

Cute

Take it back too apple show them your problem and they should give you a new one.

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