I just love people who say that things like this are a "scam".
All Target did was offer you a credit card. They didn't force you to open it, when they ask you could just say NO. They didn't force you to use it, they accept many other forms of payment including CASH(yea I know that is really hard to believe isn't it). Then it is nice how you just slip in this little comment.
although I had established a payment plan
Okay you don't establish on a Payment plan if you are current and paying on time. So is it really any wonder why you are charged late fees, and have negative information on your credit report?
Depending on the company they may or may not waive late fees. But rarely do they remove previous negative information and may continue to report you as late until you are truly current. Just be sure to keep up with the payment plan, because if you don't they will probably Charge-Off the account and if you think they are bad just wait until you get to deal with Collection Agencies.