Yeah, that’s my Experian score! 
That’s the thing, they did send me a letter saying they were going to delete, but it was written by hand on the bill they sent me, so I don’t think I have enough proof as it was not signed or anything. I tried to get an official letter from them, but they just ignored me.
I did send them a letter stating that: “cashing of this check represents an agreement to remove within 30 calendar days all derogatory information reported against this account”. Then I wrote something similar on the back of the check as well.
I was going to start by sending the collection agency a letter. Do you think it’s better to contact the credit bureaus first?