navy federal credit union Nfcu they made an error that I am paying for VA

Navy federal credit union approved me for a credit card with a $25, 000 limit. Which was not a shock since I have good credit without a blemish and great income. So I changed all my banking to navy, which I thought was a good idea. I refinanced my vehicle and changed my dirext deposit also. I had a credit card with another bank with a $10, 900 limit with a $7, 000 balance. Since I was told I had this great card with travel benifits from Navy I paid the other card off and closed the account also my checking and savings. Now 4 days later I sit with Navy card in hand and they are telling me it was a mistake. I don't have any bad reports and my income is great. But now not only am I out of the $7, 000 cash but I have canceled my card. No card and out of cash and all they can tell me is we made a mistake. But I have a wife and 2 kids to take care of. And now because of thier so called mistake I am suffering financially and to top it of no one can transfer me to a supervisor in that department.They aactually told me to go nack to the other bank. 

I thought credit unions were for the members especially one that represents the military but I was mistaken because I have been placed in a fonancial hardship because of what Navy Federal Credit Union promised me. And thier mistake