No customer service

This is the second time that I have to resort to Hello Peter because I am not being helped from branch or call centre level. I am having an issue with changing my personal details with Standard Bank. I have been to different branches on numerous occasions as well as contacting the call center to assist me with changing the cellphone number linked to the mobile app to my current cellphone number as I am no longer using the old number. I cannot use any of the facilities of the app nor can I log into the app because the otp number is sent to the old number. Why is it so difficult to assist your clients? Are the staff at Standard Bank ***********? Or do the staff need to be trained on how to assist the clients?. I am sure it does not take someone with a PhD to change one detail. Today (13/05/2020) I phoned the call centre and the recorded voice message said "we are here to support you during this uncertain time, keep safe and bank from home using our digital app or internet banking", once I got through to the agent, she told me that she cannot assist me and that I have to go to the banch. Exactly how are you supporting me during this uncertain time if you want me to go to the banch and I cannot use the app because your staff don't know how to do their job right?. Logically I would have not phoned to be assisted if I went to the branch. I also discovered that the number I once used is now used by someone else. Clearly you at Standard bank do not value your clients because if that weren't the case you would not make your clients frustrated over something you cannot do, maybe if you made mention that you cannot assist me initially at all and I would oped an account with a bank that values their clients. Furthermore due to my request via going into the various branchs, phone calls and an email which I did not get a response to I will hold Standard bank liable for any ********** activities made to my account. Please do not tell me that you will look into the matter. I need this to be resolved as soon as possible.