Credit reporting, credit repair services, or other personal consumer reports: Incorrect information on your report

I have disputed and am still disputing this late pay with XXXX XXXX. Until Today, I was unable to find all the proof I needed. Now I have it ... This late pay XXXX XXXX Keeps Reporting needs to be removed from my credit report. It is a 30 day late payment from almost 2 years ago. That is how long I have been asking them to remove it. I had to search old emails to find this. On the attached email, you will find the XXXX representative who assisted me, as well as the the TAX office person who assisted me. This XXXX representative was very helpful, in submitting this error to the credit department for removal. However it still has not been removed. What happened..Due to a tax exemption, XXXX was overcharging me. They eventually straighten it out and even sent me money, however they somehow charged me a 30 day late in the process. During this, I was told I did not have a payment and cancelled a check. XXXX is saying this is returned check, which is not true, as the money was already in escrow. Im asking XXXX to do the simple and right thing, and remove this one late pay as they promised. Please talk to the XXXX rep. She was very helpful and promised to assist me in getting it off my credit report. She stated it was being handled, before she changed departments and that it was submitted already for removal.