Did not receive 2019 refund

Due to extreme procrastination I had put in for an extension to file my 2019 taxes until October 15 but missed that deadline.  I actually didn't file the 2019 taxes until I filed my 2020 taxes in October of 2020.  I have received my 2020 refund but am still waiting to receive my 2019 refund.

I do not know what my next step should be to see about my 2019 refund.  Is there a phone number I can speak to someone to help me?