Sometimes disputing an accurate listing can backfire. Most of the time the CSR doesnt know what they're talking about. If you can make copies of the before and after comments on the account. I'd call and explain the situation and ask for a fax number to send to them to have them update it correctly.
DIsputing things can have adverse affects like this and this is why it should be reserved for things that are reporting incorrectly. If a creditor wont grant a PFD disputing it even it they say to do so isnt going to change anything. If the account was PIF in March than this reporting of FTP in April would be incorrect. You would want to use the direct dispute to correct it. Once the account is corrected you want to just leave it alone so it can age in Ficos eyes. To try and get it removed now would require a GW letter.
I suspect the FP (Charge-off) will have an impact on your score as a recent derog remark. For what it's worth, I paid a Green Dot Platinum account which had been charged off but ended up paying in full, and then wrote a GW letter to their EO a year or so after and they deleted the tradeline. So if at first you don't succeed, give it another shot later!