I cannot trade my shares

Good Day Hello. I am a registered MTN Zakhele futhi share holder. I emailed a change request for my bank details to be amended last week Tuesday to Nedbank which is operating the call centre on behalf of MTN, I made a follow call the following day on Wednesday and the agent that took my call confirmed that they have received the email and all the required documents have been provided. The agent also escalated the request and made a promise to me that my trading platform will be updated with the correct banking details and I can be able to trade yesterday. Since yesterday, I made three phone calls to the call centre, each call not lasting less than 15 minutes and I was basically taken from pillar to post.The supervisor called me around 15h00 today, only to tell me that they are working with over 89000 shareholders and I must just be patient and she cannot give me a date or a deadline as to when will the changes be effected. I need to trade my shares , please assist. Why does it take so long just to change details?For security purposes I wont be leaving my ID number or trading account number, my contact numbers is ***.