Get your taxes done using TurboTax

I received 1700 of my 2200 stimulus check. They forgot a dependent. I had already filed my 2019 taxes. One dependent was born in 2019, I am guessing that is why. I would like to know who to contact. The IRS is not taking phone calls and there is no information on the internet as this is very soon. I would like to know when the remainder is coming or if I need to contact someone. Any info out there please share