Credit card debts can be completely forgiven in bankruptcy as long as you did not run up credit card charges just prior to filing for bankruptcy protection.
After you file for bankruptcy, it is against the law for credit card companies to pursue you. They must refrain from calling you, cannot file a lawsuit against you or proceed with a lawsuit; they cannot record liens against your property; they cannot report debts to the credit reporting agencies; and they cannot seize your income, bank accounts, or property.
When you file for bankruptcy, something called an "automatic stay" goes into effect. The automatic stay usually prevents most actions from moving forward against you. No more harassing phone calls or letters, and no more threats from lawyers.