I made an estimated payment for 2018 taxes in order to meet a CC spend threshold, and entered that additional amount paid into my 1040 and requested a refund for that amount, plus whatever I was owed besides that additional payment. I just got my refund and it's only for the original amount, not the full amount with the estimated payment. It seems it's because they didn't process the additional estimated price at the time they processed the tax return, so they just adjusted it down to the original amount without the additional estimated payment.
What can I do now to get the refund for the estimated payment?