Spending and reimbursement benefits for Retirees

Have been talking to representatives for the past 3 months regarding refund of my reimbursement funds. Everyone giving me the runaround. I am talking to a manager now regarding this situation his name is Terrance. I am a retired employee, change over to AON-ATT and has been having problems ever since. Don't know if this the right department but I figured I will start some where. Thanks in advance.