Why did Mint Mobile completely cut off my 4G?

I've been using mint for 2 out of my 3 month agreement. 

Today my 4G cut off, so for the remainder of the plan per the agreement I should have 2G and regular cell/messaging service the rest of the month. If this isn't upheld it seems like it's a blatant breach of contract. Now Mint wants me to pay $20 for 2 more Gb's that will literally be gone in 2 days.. This service is seeming more and more like a pathetic attempt at nickel-and-diming. I'd rather take an unlocked phone and pay $30-mo for unlimited data. Thnx

Looks like you went over your monthly allowance. Can you check after the monthly reset if you get 4G back?

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