Invalid WiCodes on Cash Back vouchers for Rewards

I have 2 Cash Back Vouchers where the wiCodes do not work. <br> The first voucher expired 31/12/2015 (wiCode ***) - when I went into Pick 'n Pay to redeem the voucher on 30/12/2015, I was told that the code was invalid and that I had to pay cash for my purchases. <br> Again yesterday I went to Pick 'n Pay to redeem another voucher (wiCode ***) - the voucher was valid until 31/01/2016 - again the lady at Pick 'n Pay tried endlessly, but the voucher kept coming back as invalid. <br> Today I called the call centre on *** - after being transferred to 4 (YES FOUR) people, I was told that they are unable to assist and that I should call ***. Upon calling this number, I received an automated message advising that this number is no longer in use. <br> The first voucher was for R90 and the second voucher that was due to expire today is for R500.<br> Can someone please call back with new wiCodes, as I refuse to call the call centre again after having to confirm my personal details FOUR TIMES during one phone call over a period of 15 minutes!