Need help with IRS mistake on short refund than what was in Turbotax filing

Details:
- filed an extension on 4/15/24 for 2023 tax return because delayed home sell via Turbotax. but paid $10k to IRS proactively during extension to avoid future interest.
- I filed my tax return on 7/7/24 electronically via Turbotax. Refund requested was 20503.00
- IRS refunded me with $10503.00 on 7/31/24 which was short by exactly $10,000 which is also the amount i sent to IRA during filing extension.

I am trying to have IRS review this and correct the mistake.
I tried xxx xxx xxxx more than 20 times with prompts that allows human conversation but every time i ran into "we are very busy, try other times". Need help, dont know what to do.