Medical Bill bought by transworld systems

I’ve been disputing a double charge bill from Transworld systems inc who bought my debt from the hospital about three years ago. Every time I dispute on credit karma for being fraudulent they send me a letter to fill out for a police report. I’ve called them in the past and I have been willing to negotiate a closing price with them but they never go through their word and I never receive a letter for settlement. I explained this on credit karma dispute and this last time I won again. The only time they send me a letter is when I win these disputes and they mention they will contact the creditor for verification. I’m just hoping this time they dont reopen it and it’s final.

What do you guys suggest to do? Anyone with experience dealing with this company ?