Citibank Prepaid Card Complaint

Citibank Prepaid card department,

Gift or merchant card Managing, opening, or closing account California

My Citi prepaid card expired ( - - ) as I did not check the date and was saving the same for special day gift. ( balance $96.00 ) I called the customer service and was told that It its expired and nothing can be done and money is lost too. Feel so bad how Citi can do like this.