Nedbank helpless in the face of their own technology

I was using the new Nedbank Money app happily - until I got a new cellphone, with a new simcard. Since then, I have had non-stop problems, from connection and MMI errors, to my account being locked. The technical call centre has twice been unable to help me. A previous one said there was a known bug with usernames not being picked up, the latest two got me to try the same thing at least 8 times on id.nedbank.co.za, unsuccesfully, and now I must go to the branch. Grrrrrrrrrr