Online banking so secure I cannot use it

Absa changed my online banking from a pin being sms'd to a save secure system without ensuring that it could work - or without asking. My cellphone is not able to handle the new secure system. I did call the call centre - their advice - switch the phone off, remove the battery and sim card and restart again. I fail to understand how that would update the software of my phone. I am not comfortable with a bank dictating what phone I am to use, This fault was reported, and handed over to the technical department. After a week, I received an email asking me if the fault resulted being cleared all by itself. In 12 days absa bank was not interested in solving this problem or providing any further feedback. The only way I can use my own banking is to use somebody else's phone. This is very inconvenient