Credit Solutions

I checked my credit report & found out that i owed money to Credit Solutions Corp. So I called them to ask them what it was about. They told me for a credit card with a limit of $300.00. I remember paying off the credit card. But the lady who I spoke with told me if i paid $300.00 out of the $523.00 they said I owe it would be settled and she would send me a letter saying I paid it in full. I called a week later to be told that it was only a payment that if i pay another $150.00 or so then I could settle it. She also advised me that the agent who I had talked to first was being written up for making the settlement of $300.00 to me. They disrespected me and my husband when he called in about it. I requested information on the credit card company and they would not give me any. They just advised me that I had to pay more money to settle but every agent in that company keeps telling me something different. if you can please help me.