Cell phone banking

Cellphone banking lockdown I use my finger verification to log in with all the hand washing and cream I have blocked myself out , I am in the Uk for treatment I have called the help line with no avail I have been to Barclays and the atms here which cannot help My fiancé went to FNB cedar spoke to the bank manager told me to write an email to my FNB this was four days ago no one is interested to help on the banking app you cannot even send s complaint in All I need to do is go to my settings to add my email address this way I can change my password and FNB cannot help I am stuck here and need to do payment , expats moving need to be aware of the hugely lack of service FNB gives once you are out the country how does one solve something so simple my dilemma purely frustrating and disappointing service