unhappy client

im writing this as a very disappointed client, i received pick n pay cash off vouchers in mid jan this year, on the 26 feb, i went to pick n pay to redeem them, only to find out that they all expired in jan, they were valid from november 2015 to jan 2016, my question is why send the vouchers to me if they already expired?<br> this is bad costumer service, i couldnt redeem my voucher because of the late delivery, this is unacceptable