I have no idea what you are even complaining about ... if YOU completed the tax return incorrectly using the TT DIY program then you can amend the return for free ... when the 2019 online version goes live in december you can use the Amendment process ... and if you are more specific in what went wrong then someone here may point you in the correct direction.
If not then here are the Turbotax guarantees ... not sure if you qualify for any of them again since I don't know what went wrong :
What is your "Maximum Refund (or Tax Savings) Guarantee or Your Money Back" all about?
Simply put, our Maximum Refund (or Tax Savings) Guarantee says that if you get a bigger tax refund (or owe less taxes) through another tax preparation method, we'll refund the purchase price you paid for TurboTax.
As with any guarantee, there are stipulations — for example, you have to notify us within 60 days of filing your return in TurboTax, and your return must be identical to the return prepared using the other tax-prep method.
You can read the fine print at the Intuit Software End User License Agreement. Type "maximum refund" in the Find feature in your browser (usually listed under Edit) to go to it quickly.
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