This is probably super late, but good luck. Equifax can be that way...I had a paid charge off with a Citi CC that I tried to get a goodwill deletion on, and Citi offered to "do me a favor" and report that I disagree with the account. It tanked all my scores by 15-30 points, my Equifax dropped 30 points and hasn't recovered since (this was last month, and the last activity was in early 2020 when I paid it off). My EQ Mortgage score dropped like 10 points though luckily (compared to Fico 8). My TU and EX seem to have recovered after I asked for Citi to remove the "dispute resolved, consumer disagreed" statement.
After that I kinda gave up on GW letters since everyone else denied or didn't respond...except for Synchrony Bank that deleted a 30 day late payment on my Amazon charge account that was closed about 1-2 years ago (it was paid in full on not a charge off, but the account was closed after that 30 day late). And that 30 day late remove had like no effect on my credit, probably because I had other lates and 3 paid CO's.
