Data and Contact Management Solutions, LLC Debt Collection Complaint

Data and Contact Management Solutions, LLC Debt collection department,

Credit card Cont'd attempts collect debt not owed Debt is not mine Georgia

This is dealing with an Estate Debt. A major credit card company hired a Collections Agency to collect a CC debt after my mother death. I am the legal administrator for the estate. Upon contacting both the CC and the debt collector, I was told by the CC the debt collector is the only - that can now neg. the debt with me. Upon contacting the debt collector I was informed by the collections company that if I wanted to settle below a certain amount, they would need to verify the amount in the estate account and where asking me to provide a bank account statement. I feel they have no right to request such a document. Is this legal?