Poor communication when wanting to resolve situation or close account

I am in Portugal and have been trying to resolve the issue of registering a contact number to be able to continue using the online banking. I have been in contact with Sharon Jutz and Linda Ndzandza since June 2020 about this simple matter and it is still not resolved. I was then in contact with Sharon Fitzgerald. During lock-down I had to find 2 willing Portuguese people to accompany me to a notary and at cost had to notarised documents to be sent to the branch in Cape Town to give permission to change my contact number, only for the purpose of using online banking. This package was then delivered yet no one received it and I also don't have record of who signed for it. Tracking number RH***PT. I was also told to contact Request to update information: CRM: ***7, yet again this only asked of me to send notarised documents. At last I then contacted Sharon again yet to this day no response. I would really like to close my account as it is costing me more just to keep it open and change the contact number and I also asked Sharon about closing the account with no answer yet.