Staff can't do their jobs

I have never had such problems with a company like i have with Vodacom. First i app**** for a phone contract and set a limit as to not get a surprise bill at the end of the month, the staff member at the time told me that it had been done and still it went way over what my limit should have been only to find out that a limit had not been set, so I had to pay for a mistake that YOUR staff member had done. Now I was contacted by one of your telephonic sales staff and I app**** for a data package which included a router. While going through the procedure with this staff member I indicated that I could not present a proof of residence and was told that it would not be an issue, considering i have my details on file already. When the product was delivered however this was indeed a problem and I could not take delivery of it without my proof of residence. I have now been trying to ensure that this application is cancelled and the rudeness from the assistant over the phone was unacceptable. I was told \it has not been returned to us so if it doesn't get returned who's problem is it"I will gladly give my details if requested but I will never give my business again. Fool me once."""