Deductions & credits

I have the same exact codes  but mine is 810/811 on 02/21/22 and then code 971 notice sent on 02/21/22 and then 420 on 02/04/22 . It’s confusing before it has 424 on 02/04/22 then 810/811 on 0n 2/21/22 then notice sent 971 2/21/22 that changed to the first set of codes I put in this reply. I called the irs and the first agent told me a notice was sent and from what she sees it’s about sending proof of eic , ctc  and it was sent to me on 02/04/22 then I called the tax advocates and they said it’s taking about 4 weeks to even get an assigned tax advocate but most likely they wouldn’t pick up my hardship due to the fact they are only taking on cases where u owe money and need it stopped bc of an hardship . Which means I’m screwed . The second agent I spoke to said that I could fax in my proof of eic ctc hoh stuff now and gave me the fax number and location of my irs office handling it in mass . I asked how long would it take from when I fax the info in and he told me due to the pandemic they are short staffed and have trailers again holding peoples tax returns and that it’s averaging about 150 days from receipt of my proof smh . He state my letter was supposedly sent on 02/04/22 but here we are 10 business days from the 4th tomorrow without a notice in my mail! Seeing the notice sent date was 02/21-22 I’m guessing since that is 21 days from when i originally filed that means I should see a notice by that date or that’s the date they will mail the notice idk. Idk if the agents really see that the letter states I’m being asked to prove this or they are guessing that’s what the notice will say . So im wondering if u see notice sent on ur transcript and if h received one yet or if the people who started this thread that saw the codes change to 421 ever had the notice issued on their transcripts ? 810 is freeze and 811 is unfreeze so why did they unfreeze it if they are asking for all of you to send proof in and what it means that

they unfroze it I’m so confused and stressed