Vodapay issues

On Sunday 10/09/2023, I had purchased a R150 Krispy Kreme voucher via Vodapay app as I had noticed a promotion where you would get a free R30 voucher. The voucher payment had went through and I received the R30 voucher to use within 3 days. My R150 voucher did not show up so I went to the Pavilion Vodacom store for assistance and was advised that the vouchers do no reflect immedatly and also due to the fact that it was a weekend it may take longer. I tried using my R30 voucher to purchase a second voucher however it had told my CVV number had expired. I tried removing and re-adding my card however the app kept loading and gave me issues to remove the card. I tried again on Monday and the issue persisted. On Tuesday I went to the Vodacom store in Gateway as I was still experiencing this issue. I tried again however when trying to load the vouchers I kept getting an error message which states I should try again as if the network timed out. I tried again this morning with a different card number and it kept telling my card had expired however I use this card and the expiry is 12/25? I kept trying until my R30 voucher expired and now the app seems to work fine. It seems like Vodacom intentionally had issues when I tried to use my R30 voucher however seems to be resolved immediatly after my voucher expired? I am not sure if this is a marketing method to get customers to purchase vouchers and are promised free R30 vouchers and once you purchase them the app has issues and once the voucher expires the app works fine?