How do I contact someone at Turbotax about a mistake they made on my return? It should have been $600 and not $1200 on stimulus payment.

I divorced in February 2020, filed married last year and single this year but Turbotax entered $1200 for stimulus as if I was still married.  I did not catch this until I didn't get my refund as expected and then looked over the return more carefully.  This should have been caught by TurboTax.