Mortgage question regarding Adjustable rate?

We bought a house in december 2006 with adjustable rate, we plan to refinance between march and april because we are planning to use our tax return to pay our credit card debits so that our FICO score can be increase so that we can take advantage of the current mortgage interest rate. But today we receive a mail that stated that our monthly payment has been increased from 7.7% to 10%, which make our monthly payment from $ 1500 to $ 1800, that is $ 300 increment need advice on what to do, how to communicate with the bank so that the new increase will be freeze for the next 3 month. please help and no information is too much. Thanks

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