poor banking service

i have been a client of nedbank for a few years now and am very disappointed at the way i have been treated. i recently relocated abroad, unfortunately i was not properly advised by the bank consultant on how to gain access to my accounts in South Africa. having sent numerous emails in trying to get nedbank to change my cell phone details on their system so that i can receive SMS's on any activity on my account. i also cannot do any online purchases as nedbank has my old cell number. please can you help as i'm stranded here not being able to do any purchases on my card. this is an urgent matter. my new cell number is + ********** 40644