Told cell number updated yet its not

I just switched to nedbank, went to Cornubia branch Durban, they updated my details etc they had my fica details from when I had car finance with them, now when I try the nedbank app it is sending the approve it too my old number yet I was told my number has been changed, I want this fixed without having to sit at the branch for another hour. I sat my entire lunch break at Cornubia branch to get this account opened even though I had already app**** for it online. What I want to be done is number to be updated without me going into the branch because I already was there and told its done.