Woolworths new loyalty scheme

Have tried on numerous occasions to get the MyDifference part of the Woolworths app to work. The call centre is helpful but the functionality only lasts a day. This must be the most pathetic changeover to a new loyalty app I have ever experienced. The effect is that you cannot access any benefits in the app and cannot nominate a cause. The previous app and My School Card worked 100%. I am seriously considering cancelling the card (which I pay for) to stop this endless frustration. The call centre says the app has errors which the developers are trying to rectify. Why change to a non-working loyalty scheme?