Still no 2020 tax returns...

I filed my 2020 tax returns electronically on 03/03/2021 and received a letter dated 05/34/2021 from the IRS. The letter said " Please note that we are unable to issue this refund by direct deposit. Your refund will be issued by paper check within 2-3 weeks", but I still haven't received it. I haven't been able to get ahold of a real person by phone at the IRS. I've tried to track it down with there website but they can't locate it. What's my next step? Do I fill a 14039 form out even though I'm not fully sure if I was a victim of identity theft? Any help would be greatly appreciated.