Refund not recieved

Hello, I filed my taxes back at the end of February. TurboTax confirmed that they were approved and everything. I received a letter in the mail stating that I owed $20 so I paid my fees on the IRS app and to this day I still have not received an update or anything. I call the IRS and they hang up, I don’t even get to speak with a rep. This is such a huge inconvenience for me and I just need help or advice on what to do..