Citibank Debt Collection Complaint

Citibank Debt collection department,

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

My wife passed away last month, she had a personal credit card and a personal account with Citibank. I also have myself another personal account with Citibank, where I receive my salary. On this specific account my wife was a co-signer. After she passed away, Citibank is now charging me the bill of her personal credit card. Which I have nothing to do with. She had no will or state. I do n't think this is correct Citibank trying to charge me of debits from her personal credit card.