Horrible service ever!

Dealing with Vodacom has been the worst experience ever, I can’t believe that I finished a 2 year contract with them and each and every change made on it was never communicated with me and when I call to query it they promise to send an email as we are done. How do you guys do business if you fail to send correspondence to clients? I am due for an upgrade and I am still waiting for communication so I can take a new contract but as soon as I ask for previous correspondence the agents request to send me emails or sms. This kind of service is horrible and a person needs to be aware of what is happening in their account.