Debt Collector

I contacted the debt collector company Equable Ascent Financial after they validated my debt. I wanted to make a settlement with them but they told me they dont actually settle the debt. They also told me that I had put disputed on my credit report and I had to remove the disputed which meant that I agreed that I owed the debt to them. Equable bought my debt from Chase Credit Card and Chase said that Equable now owns my debt. Is it true that I have to take off the dispute before negotiating with Equable Financial? They said they had to send my debt to collection agency I thought they were the collection agency. They are trying to get me to admit that I owe them debt and I still dont think I owe them but I owe Chase. I never made any agreement with them.