How did you pay it? By check or online? If you said it was an estimated payment they may have applied it to next year’s tax return.
What line does your 10,000 payment show up on? It should be on scheduled 3 line 10. And go to 1040 line 31. If its on line 26 that was for an estimated payment not an extension payment and the IRS will think you didn’t pay it.
