SBI — voucher against Rewards points is not delivered since 3 months

HI, My name is Sudhakar, i have requested for Life Style voucher against my rewards points. i have requested it on December 2014 and i got a message that my voucher will be delivered by January 13 2015 from first flight courier, but till now i have not received the voucher. i went to first flight courier office but they have not responded.so i called SBI customer care and requested for cancellation of that voucher, they have taken request on[protected] and provide me the Ref No :[protected] for the same. From that day i am receiving the calls from first flight & SBI customer care asking whether i have received the voucher or Not ? I say no then they are disconnecting the call. this call was repeated 11 times from both the customer care till now but they are unable to resolve my request. They unable to deliver the voucher OR cancel the reward request. I am getting irritated so before i s** them i want to go with consumer court. Please help to resolve this issue.