Waited 30 minutes without speaking to anyone

I have been trying to do the simple task of changing my e-mail address with the city of Cape Town. I have done e-mail queries and got replies (more than a week later than my initial query). They gave me a link to go onto do change the address an upload files, but I had a query and therefore tried to call the call centre number. I waited 30 minutes hearing only music and voice messages in my ears. I am still to talk to a consultant to assist. This is hugely frustrating as something that should take a few seconds is now taking me hours of wasted time. All I want to do is change my e-mail address!