Terrible experience with FNB's banking systems and assistance.

I'm trying to get my Homeloan account FICA'd but FNB is making it extremely difficult in all aspects to get anything done. FNB boasts that they have the most advanced systems and technology available for banking but I can confess otherwise. I've never been able to use the mobile App because they keep sending the OTP to the wrong number even though my number has been changed according to the lady on the phone at homeloans and in her words (I don't know) when I asked her to change my phone number. I've been trying to give notice that we want to sell our house but this small little task seems very difficult for FNB. I would NEVER EVER do banking with them and it seems that my current banking needs are best fulfilled by the other bank that I'm currently banking with.