Unsatisfactory service

Nedbank keeps on forcing us to use their app but when I use the app, it gets locked and they say there is suspicious activity after making a few transactions. My cellphone banking is locked as well and I'm unable to transact. I've called the Call centre a number of times and they pass me from pillar to post. The last agent told me to go to the branch and I don't have time for that because it means everytime I use the app, my profile will be locked and I have to go to the branch. I need this fixed over the phone RIGHT NOW!!!!