Voucher Expiry Date : Unfair Service

I had a wedding gift registry from @Home in 2011. After the wedding, I took back gift duplicates to the store and I was given a voucher worth R872 which according to the receipt I received from the store was to expire on 21 March 2014. On 21 March 2014 I went to @Home in Kolonade to redeem the voucher given that it was the last day to utilize the voucher. To my surprise, I was told the voucher had expired on 20 March 2014, the previous day but I showed them that the receipt they gave me before had an expiry date of 21 March 2014. To date, no one was able to assist me and I would like either the R872 back as it was presents from friends and family or they must just activate my voucher so that I can utilize it. Gift Card Number:***. It was captured by Martha and Transaction number: CA*** (@Home, Kolonade). I am still in possession of all the receipts including the gift card received.