Unsatisfied customer

I'm struggling logging into the money account app, i keep getting 2 sms's with the link and when i go into it i get a message saying "Hi there, this is not the valid device.Please click on the link in the SMS on the that intitiated the registration process." But i using the very same device since i started banking with old mutual and the same number. I tried doing internet banking but it wants a password only God knows what it is, I also tried contacting the help centre on both *** and *** but instead I'm holding for 20minutes. I even tried sending a email but no help at all. Can you please assist me