Mary Received a Non-Solicited Selection of Compact Discs in the Mail,with

Mary received a non-solicited selection of compact discs in the mail,with a letter informing her that she was now a member of the CD of the month club.It also said that if she didn't want these CDs,she could simply send them back; otherwise,she would be billed $10 for each CD at the end of the month.She simply put them away,and did not respond.They continued to send her more CDs each month until she had received 100 of them over a period of 10 months.The club then sent her a letter demanding payment; otherwise,they would take legal action.Explain her legal obligation in these circumstances.