<human>: Summarize the given text in a few sentences.

Hey PF,

In June 2013 I had a hospital stay at St. Louis University. I moved from St. Louis to another city shortly thereafter and never received the bill. Fast forward to February 2015 and I start getting nasty calls from a collections agency, Central Financial Control. After arguing, trying to do a pay-for-delete for a few months, I pay it off in full in May 2015. 

On my credit reports (equifax and transunion), it's showing a "charge-off" for this collection in July 2015. From googling, it's my understanding that a "charge-off" is when someone doesn't pay the amount and the company writes it off.

But I did pay the amount. In full. I tried disputing this with equifax and transunion, but they declined to alter it on my credit report. The collection account reads as "paid in full" and closed on my credit reports from creditkarma. 

So my questions are:
1) What are the implications of having a charge-off on my credit report rather than...whatever happens when you pay a collection in full?
2) Should I dispute this?
<bot>: have a charge-off on my credit report from a medical collection I paid off in full. Don't know what this means or what to do