Details not updated for 2 years

I have tried to update my cell nr for 2 years now. My old cell nr no longer shows on the branch's system,nor head office when the branch phones them,but I am still not receiving my OTP.The call centre no longer accepts my login deails which I use to access my internet banking,so I can't get pass the computerised voice. I have emailed the contact centre.Received reply that someone would contact me in 48hrs.It's been a week. If tis is not sorted today,I am moving to Nedbank tomorrow. I've been a loyal customer for 20years,but this is now beyond ridiculois!