I didn't get my 2019 refund.How do I find out about it?

Did you check your online account at the IRS yet ?  https://www.irs.gov/payments/view-your-tax-account

Did they process the 2019 return and release the refund yet ?   If they have you can either put a trace on the payment and/or try to call the IRS ...

Here is the normal method to reach a live IRS agent when they are operating smoothly, and I'll also tell you below how to reach the IRS Taxpayer Advocate Service, if needed.

IRS:  800-829-1040 (7AM-7 PM local time) Monday-Friday

When calling the IRS do not choose the first choice re: "Refund", or it will send you to an automated phone line.

• First choose your language.  Then listen to each menu before making the selection.
• Then press 2 for "personal income tax".
• Then press 1 for "form, tax history, or payment".  
• Then press 3 "for all other questions."
• Then press 2 "for all other questions." 
• It may then ask for your SSN, but do not enter it.  Just wait.    If it asks for SSN a second time, still do not enter it.
• Then it will get "tired", and you'll get another menu.  Choose 2 for "personal".
• Then in the next menu choose 4 for "all other inquiries", and it should transfer you to an agent but expect a long wait.
• I usually use a speakerphone so I can work on something else while waiting.

If you continue to have no luck reaching the IRS, you can try contacting the IRS Taxpayer Advocate Service for your area.    They are especially prone to help if you have an economic hardship, or if there have been continued delays with lack of info from the IRS.    At the following IRS website, find the USA map and click on your state, and it will give you the number of your IRS Taxpayer Advocate.    If the Taxpayer Advocate can't/won't help you, ask them to transfer you to an an IRS agent.  A couple of users reported that at least for them, that was a backdoor route to the IRS.

http://www.irs.gov/uac/Contact-a-Local-Taxpayer-Advocate

Also see this article for more info on how the IRS Taxpayer Advocate Service works::
http://www.irs.gov/taxtopics/tc104.html

Did you efile?  Was your return Accepted?  Maybe you didn't finish filing or it rejected.

When you efile you get back 2 emails.  The first email only confirms the transmission.  The second email says if the IRS (or state) Accepted or Rejected your efile. Just paying the fee doesn't file the return.  After you paid did you continue on to the very end and hit the big orange Transmit Returns Now button?

When you log into your account you should see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc.  what does it say?