My question involves business law in the state of: TN
My company is a web-based business offering an online subscription service with monthly auto-rebilling. Recently, we received a notice that a website subscriber had filed a credit card dispute for several months of subscription fees. This customer who is disputing the charges has never contacted us directly and has not personally responded to any of our attempts to contact her. We recently received a letter from an attorney, who is also the customer's father, stating that all future contact regarding the disputed charges should be directed to him. The father/attorney states that he has disputed the charges on his credit card. However, the contact/billing information that our company has on file is under the customer's name, not the father's/attorney's name. The customer is over 18 years of age. Does my company need written authorization from the customer directing her father/attorney to act on her behalf (or is the letter from the attorney sufficient grounds to contact the father/attorney directly regarding the matter)? If so, what type of documentation is required? Thank you for any input!

