App not working

Hello, I have been capitec bank customer for around 2 years. After trying to electricity recharge on 29th Aug ,the app crashed and ask for activating. I called contact center and was asked to approach branch.Taki from Cresta branch tried uninstalling ,resintalling ,checking sms options.The app asks to give user details and app crashes. I called customer care and informed cresta branch to fix the issue since without the branch I will not be able to do app banking or internet banking.Even after 3 weeks and several phone calls, they have not been able to solve the issue. The it team just passes buck easily saying its phone issue but it has been working on phone for last 2 years and I personally know 2 other customers with same issue