Unable to Get Internet Banking for My Mother

My mother has been trying for some time to get Internet banking but cannot get this done. It should be easy. We have tried online but the website rejects her details. We have been to the Southgate branch but they dump us in front of computers whose networks are so slow that they cannot even load the Standard Bank website and they then walk away. We spoke to the Standard Bank call centre today and they told us we should rather install the app as that would solve the problem. That lets us make even less progress than when trying to use the website on a decent network at home. This is ridiculous. I have had Internet Banking for years but my mother, who has been a customer longer than me, cannot get Internet Banking for herself. Who is the specific person that can help us and at what time of the day? The nature of my job means I am almost always unreachable by phone from 8AM to 6PM during the week and then I get onto planes in between with regular frequency as well. Who is going to help my mother so she can get this sorted once and for all?