The IRS website said it needs me to verify my return/identity & I can't do that without the letter they say they sent out bc I need the 14 digit number from the letter in order to verify it's me. I've never received a letter from the IRS. Help.

I can't get thru to them on the phone , I used my current address when I filed my return, but I haven't received any mail from them at current or old address ( I checked just in case). I can't use the online verification tool (it won't even give me the option to). When I check the where's my refund it says have my letter ready when I call the toll free number for the IRS but how do I tell them I never got a letter of I can't even get thru to anyone. 🤦