Poor Service

I sent my change of details form to [Email Removed] on 27 October to change my cellphone number. After 2 days I called the mtn zakhele call centre to find out if it has been done but it wasn't and was told it takes 3 days to change it and I should call the next day. I then called on friday and was told it has not been changed it takes 3-7 working days I then requested to speak to a supervisor and was given a guy by the name of Siya, he asked to which email address I sent the form I told him I sent the email to the zakhele email address as written on the form and he said that was the incorrect email and I should forward it to [Email Removed] and he will sort it out for me. On Monday morning I checked my emails to see if he had responded but he hadn't so I called and he said he will check his emails and get back to me but he didn't I then called back later in the afternoon and he said he rep**** to my email saying I need to send a certified copy of my ID but I never got such an email from him. I agreed and said I will send it and he said he will sort it out but he still hasn't. Today I called at 10:50 and he was on a call and was told he will call me but he hasn't.