Refund incorrect

I filed my taxes in January. I waited and waited and turbo tax took forver to get my refund.  I finally got my refund by the end of February. But the total wasn’t the amount that Turbo Tax accepted.  I was supposed to receive $2,511 but only got refunded $1,111.  Where is the rest of my money? I called the irs and can never get a hold of them. Every time Iv called they tell me to call back because they are too busy to take my call.  I go online and it says the adjusted my amount.  Reasons being my social was incorrect or I made more than $75,000 a year or I have invalid dependents.  Iv checked over all that information and I do not fall under any of those terms.  I didn’t make more than 75k a year and I’m single with no dependents. And my social is correct. I don’t know what to do now to address the incorrect total I received