My 1099-G shows a different [$542] amount for my state income tax refund from 2017 than was actually accepted according to turbo tax which shows $267. What should I do?

[KrisD]

Use the amount the state is reporting ($542). 

The irs matched forms, and if they match your 1099-G, $542 is what they'll see. 

Why is it different I can't say for sure, but you may have amended your return, the state may have adjusted your refund, or the state may be adding an additional amount, such as a property tax refund.