What does this mean?

Today I went IRS website to check the status of my amended return for 2019. And the system shows the following notification:

"Your amended return was received on April 13, 2020. However, it has not been processed. We apologize for any inconvenience.

Please call 800-829-0582, extension 623, between the hours of 7 a.m. and 7 p.m., Monday through Friday. You will need a copy of your amended return."

I tried to call the number with the extension they provided, but no representative answered the phone because of the extremely high volume of calls.

 

Should I continue to call the number or just wait?