I was too naive to believe documents list in the cover letter since it already mentioned 2 photo IDs (some friend told me people got trapped by that).
However, they requested additional documents for proof of name, which has to be a letter from government. In the cover letter it says it can be utility bills, bank statement.
I filed a complaint and they did admit that the cover letter doesn't match required documents. But they seem to have no intention to fix it.
So I have to wait for another 4 weeks to see anything more is needed. Hopefully 7 weeks in total is enough.