Turbotax said I'll get $1490.15 for tax return refund but I only received $269.28. I even paid for doing tax return with medical expenses. What could've happened?

Did you claim any credits that you were not entitled to? If you look at your notice of assessment it will show you where the difference comes from. 

How do I submit a claim under the TurboTax 100% Accurate Calculations Guarantee?

Thank you for choosing TurboTax.