Mission to change a phone number, unhelpful, arrogant staff, still not done, given the runaround

I have an account with std bank since i was 18 years old.. regretfully the service has been nothing but shocking... i changed my ph number a year ago,i went into the branch earlier this year to update my details and to collect a new card, this process was quick and efficient, or so i thought. I tried getting into my cell phone banking and it kept on sending the otp to my old number. I got annoyed and left it for a while an used another account. then i tried drawing money at the STD ATM at Howards Centre which is right outside the branch, and the card would not work, so i walked in and there were 2 ladies sitting there, no acknowledgement, not even a look up, which immediately irritated me because now i am confused, the set up has changed since the last time i was there and is this new setup enquiries also?? any how i was assisted by a very unfriendly lady, who had a blank look when i told her i needed assistance, long story short, she assisted me, so while i was there i also explained the problem i have been having with the otp being sent to the wrong number, she said she would change it and she did.. once again or so i thought. So a few days ago i tried accessing cell phone banking, once again the otp was sent to the old number, i was beyond agitated. I tried calling the ***and i was holding on for so long i hung up and decided to go into the branch, i went there yesterday and the lady who assisted my the very first time was there, i explained to her what has happened and she immediately advised that the branch cannot assist, it is the digital banking department issue, so she cannot help me, she gets up and asks me to walk with her, she hands me a phone and walks away... i sat there for about 10 minutes and that phone just rang, i couldnt wait anymore because i had to pick up my daughter. before i left i went back to the lady and explained that she just left me there with a phone that was just ringing and i had to leave, she reassured me that if i cll that number they will assist me, i asked her if she was sure and she said yes, i said to her so i wont have to come back here? she said yes.. I tried calling this morning, the wait was not too long, i was assisted by a gentleman by the name of Sanokelo Khumalo, ***, he got irritated with me and was condescending, he made me feel stupid-the more i am explaining to him what the problem was the more stupid he made me feel, i told him that the lady at the branch told me to call and the number can be changed via the call.. he said no and referred me back to the branch.. how pathetic is this??? he mentioned another card i was suppose to have etc.. nonetheless i am not impressed because i am been given the runaround, it seems like they people assisting me needs assistance-STD BANK your staff and systems are shocking!!