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I am not sure about the new company but I did pay Portfolio and they let me pay 15% less than they were asking and they completely removed the tradeline off my credit report. I would go into the conversation "if I agree to pay in full, will you remove this tradeline" it's worth a shot. They told me on the phone it was not possible they had to report blablabla but 3 months later it's all gone!
I paid them in full years ago on mine. They wouldn't budge on a deletion for me. Going to try again. Maybe calling them will work better.