Standard bank Cresta Branch

There's nothing irritating as visit Standard bank branch 3 days ,just going to do a simple thing changing my cellphone banking Number so I can login on my app, yes they changed the number but the otp that I have to receive still goes to my old number, I explained that I have to receive an otp to my new number confirming that my number is changed , but they said it I'm gonna get it within hours now it's days I cant used the app or cellphone banking, standard bank cresta needs A bit of training, and I'm not setting my foot any of your branches to spend hours on the lines they at the end you don't get proper service ,it's my second month using the bank but I must say it's a bad experience, the service is slow to the extend that I feel like I made a big mistake switching to standard bank.. can I get a clarity on what must happen I'm not going back to the Branch.