Poor Customer Service

Locked out of App/Online/Cellphone banking since Tues 9 March 2021. Bank admits an error on their side. Committed to contacting me within 48hrs, yet it is only myself who contacts them. The error is still not rectified. It saddens me to resort to this level after 20 years with this bank and always praising them to my family/friends/collogues, but I am at the end of my tether.