Ebucks issuing invalid Wimpy and Kauai voucher but attract new customers by advertising these wonderful benefits! Don't be fooled!

My hubby and I redeemed our Wimpy vouchers on Thurs, 30 June, drove to the nearest Wimpy, which is exactly 23kms away from us, to purchase the quarterly menu items that Ebucks offers. Get there, only to be told that the system is not picking up our codes but she will try it again in a few minutes. After trying thrice we left. These vouchers have an expiry date on the voucher shower expiry at 23h59 mins on 01 July so we went back yesterday to the same Wimpy. Redeemed the voucher again on 30 June at 10pm, again same expiry date, 01 July. There was loadshedding, so we waited a few minutes for the system to reboot, another customer paid with her Ebucks code and it went through so the manager tried our codes, again, invalid code, but the manager had started preparing the order anyway because she said that the invalid code may have come up because of loadshedding, so she tried again, invalid again. Order was already made! So we had to now pay for the items because it was made already. This is the 3rd time Ebucks has issued invalid codes to both my husband and I, same goes with the Kauai vouchers. My kauai vouchers 6 times out of 10 does not work. The manager said that this happens alot with the Ebucks vouchers. This was just another time we wasted time and diesel and now our money because of Ebucks. Will Ebucks refund our money and fuel for sending us on a wild goose chase? Why offer these rewards when they can't deliver? Another problem is when the customer actually calls in to Ebuck, their customer service agents have absolutely no clue in how to respond, they have no training on their own products and rewards and just cut the call when they can't answer. Why have a customer service department at all? The team leaders at Ebucks are just as ***********!