Retirement tax questions

I received a refund that is over $1500 less than what TurboTax calculated. The IRS says it is because of a miscalculation regarding Social Security income. Miscalculations and errors like this are unacceptable after having paid a premium for your software. It has cost me a lot of time to track this down. What do you intend to do about this? What kind of compensation do you intend to supply? Why should I trust your calculations in the future?