Imagine credit card Imagine credit card companies are a scam!! Delaware

I had a imagine credit card 5 or 6 years ago. I had one with a $250 credit limit and after they added all there fees I only had $60 available. So I closed out the account and tried to get a payoff amount which they never provided. So now apparently they have been charging me interest and now my bill is over a $1000!!!!!!! I am getting calls from some office that just yells and talks over you when your asking questions. They will not provide any paperwork, they just want to take a payment over the phone. They threaten you to take you to court and that you will have to pay 3 to 4 thousand dollars. This company is a scam and unprofessional. I hope there is enough people to file a lawsuit against them because I am sick of them trying to harass me!!!!!