I have recently (few days ago) re-enrolled with a debt management company. For many of these creditors I have already made payments, some I have not. If I list them on my debts with the management company can I still request a debt validation letter to get proof they actually own the debt?
Also, can I still send them a cease and desist letter to ask them to stop calling me?
Yes, before making payments to a collection agency, you can definitely ask for debt validation and you are required to pay off the debt only if you get a proper validation of the debt within 30 days. If the creditors disturb you without validating the debt, you can send a cease and desist letter, which will definitely stop them from calling you.