Change my details

Worst customer service.. They don't reply to customers query.. 6 days I had only 1 problem which could be resolved bt I have to call their call center every day and get different people which gives me different answers to my query bt no one has solved it.. I am amazed tat they service so many people especially in soweto bt their customer service is this poor.. My query is tat I want them to change details of the account holder to me as he is deceased so I can pay.. I don't have internet access since last week and I work from home...