OTP

Recently I moved to the UK. Before I left SA I went to the branch and updated my details and got myself a new card. When I arrived in the UK I realized that I couldn't transact on my app as it continously sent otp to my SA cellphone number. I called the internet banking department and they told me that they can't help because for some reason my email is not in the system. The lady said I xud email the internet banking department, I emailed them requesting that they change my otp from cellphone to email and No one responded. After having sent numerous emails, 1 month later I got a response saying they can't help I need to call the cellphone banking department to change my SA number to UK number. I called the cellphone department and I got told that they don't register international number I need to call internet banking. Such a terrible service being sent to different departments and non of them helping. The last Lady I spoke to from the internet banking told me they can't help I should come back to SA to change it in the branch. How ridiculous is that? Taking a flight from UK to SA merely to change an OTP when I know very well that before I left SA I went to the branch, updated my details and I even got myself a new card. Now am stuck, can't transact on my app, such a terrible annoyingly ridiculous service from the specific department