CHANGE OF EMAIL ADDRESS

I have been a member of HELLO PETER for several years.. But I am very annoyed by the fact that I cannot seem to be able to CHANGE MY EMAIL ADDRESS... I have tried to contact you by phone CT number.. No answer... No email... Everytime I put in my new email I am told that this customer exists & that the info is INVALID!!!???!!! PLEASE HELLO PETER AS A REGULAR CLIENT.... CHANGE MY EMAIL AS VODACOM NO LONGER HAS VODAMAIL. EMAILS!!!! ***... New email