I am not aware of a lawsuit against CareCredit, but then it's not something that I monitor. You might want to google phrases like "lawsuit against CareCredit" or "class action lawsuit against CareCredit".
If your problem with CareCredit relates to a debt collection matter and you feel that the company violated your legal rights, I recommend that you contact a local consumer law attorney with experience in debt collection cases. Find out how to get FREE or low cost legal advice about debt collection from a consumer law attorney here.
The attorney you consult with may advise that you file your own lawsuit and he or she will probably charge you on a contingent fee basis, which means that you will not have to pay the attorney any money upfront and instead, the attorney will receive a portion of whatever money the court may award you, assuming you win the lawsuit.