We are trying to do our own debt settlement and just stopped paying our credit cards 2-3 months ago.We just received a letter from NCO Financial Systems INC,is this a CA?The letter states the above named creditor has placed this account with our office for collection.Says to send pymt to creditor listed below "which is the credit card company".Says unless you notify this office within 30 days to dispute the validity of the debt this office will assume this debt is valid etc....What do I do next? Do I send a validation letter?