Disappointed Prokard member

I am sharing for those who are considering a Prokard membership, at a glance it is appealing. however the vouchers are worthless, I tried booking at different provinces at odd times off peak and peak and no luck, bookings are always not available. I currently made a online booking in Walvis Bay paid cash as the vouchers are not accepted(mind you I have 5 vouchers all expiring in February 2025) and I still don't qualify for the discount as per the T&C of the membership. I was not able to use my 2024 vouchers that were expiring in Feb this year unless I renewed my membership, after renewal I still was told that my vouchers has expired after making a fuss the vouchers were extended to June 2024. I think same going to happen again however I don't plan to renew, booking directly with the hotels is still cheaper than using the membership vouchers. So Prokard if you are promoting something when a client is paying please do it honestly. I also would like to know what happens to all my unused vouchers, seeing that I was not able to use my vouchers to make any bookings.