gift voucher — gift voucher is not being accepted at certain reebok shops

Address: Bihar

Dear Sir,
I am having six Reebok vouchers of rupees 1000 each(no:1181019,1181020,1180181,1181062,1180992,1180195).but in Patna non of the Reebok stores are accepting the gift vouchers.All the vouchers are valid up to 22nd august 2012. Hence please try to solve my problem and tell me whether i can redeem my voucher.