Remove Collection from Dr., from Credit History

[SkyMaster]

A collection agency call me last year to pay for a Dr. visit, from 3 years ago.

I sent them a check with "Payment in Full" written on it. They crossed that out, and cashed the check.

I wrote them telling them they cashed the check and we were done. They didn't agree.

i paid them the rest.

BUT now can I get the Collection, on my Credit History, chaged to "Paid - As Agreed?"

OR even removed all together??

OR take them to court to show that I "Paid in Full" we were done, now they either pay me back what I over paid them; OR at least remove the collection from my history???