Vodacom Rewards means nothing

Good Evening , Vodacom rewards must the worst loyalty program ever . In December I won Wimpy Vouchers sat down to earth then when it came to pay the system only allowed me to use 4 vouchers ended up paying for the extra R300 on the bill . Yesterday I won two Burger King Vouchers today I went to order meals tried to use my vouchers the QR scanner was not working and went into rewards history and said no voucher number available and only a QR code and they only meant to expire on the 28th . Again ended up paying for the entire order , absolutely disgusting I spend so much money on airtime and data get rewarded but can never redeem them 😡😡😡