Need assistance with my banking app( overseas )

I have been trying to contact Capitec from New Zealand for days on end. I am listening to their music over and over without so much as a voice prompt or being out on hold, which is understandable and what we’ve come to know from businesses. I would like for someone to answer my calls. I need my remote banking app updated with my international cel number as the app has been updated and I’m unable to have it updated with my old number. I simply would like to have my calls answered. It’s not a big ask. I have to try at night so that I teach them early in the morning and still the service is not up to scratch. Please understand that this is not easy. Thank you