Vodacom miss places confidential information

I recently transferred my account onto my name from my mother's name. At the begining of the month my mother gets charged, went in to find out why I'm not being charged as the account is on my name, only to find out that Vodacom didn't do the transfer. So I phoned the Cresta branch to correct the issue. They now tell me that I need to resend all my details as they don't have them, so Vodacom has lost all my confidential information and they want me to do the job that they were supposed to! I can't believe how useless their service has become. I have had endless problems from the work go with Vodacom and frankly I do see why I need to do anything for them to correct this issues as they should have all my details. And if they don't then where has my information gone?