Tymebank not up to standard

Buying prepaid electricity on app and online (web page) does not work. 24 hour support line only start work at 7am. Can someone please explain 24/7 to Tymebank? Card declined at several small shops. Even in Pick n Pay if the POS is not perfect card is declined even with positive balance. Very embarrassing. Lesson learned Stick to the big banks that do this full time and not as a hobby.