What's the point?

This is now the second time I am experiencing a problem with the App. The first time was at Burger Bistro in Centurion and now yet again at Spur Queenswood in Pretoria. Although the app verifies that the voucher is redeemable, and me assuring myself of the fact with management at Spur before ordering. Well to my surprise when payment had to be effected the voucher could not redeemed when asked for the store pin to be entered by the store. Encountering this problem again I immediately contacted the Entertainer area rep by the name of Candice as I had her details and she requested that should I have an issue in any manner regarding Entertainer I was to contact her. Well I called her immediately but could not get through. I sent her I whatsapp later, and it confirmed that the recipient seen and read the message. This was on 23/10/2021.I have not heard from her ever since. This is rather embarrassing when one expects the voucher to redeemable as valid o ones app, only to have to pay the full amount at paypoint as the app won't accept the store pin that is to be entered by store. So what is the point?!