" I filled out an amended return the next time (or did something) and got a letter from the IRS saying I was not eligible (or something like that)."
Since you are not even sure what you did, it's hard to say what the next step should be.
If IRS said you are not eligible, you are not eligible. no ifs or buts.
They will say again you are not eligible if you retry
If you are not eligible, there is no check to trace.
@herojig
