Worst service again from Vodacom online.

I had a contract with Vodacom for years. 2 years ago, I decides to cancel my contract because of the bad service I was receive from them. Now I made a new application hoping that maybe the have change the way they do business. They promise to phone me back to give the outcome on the application, no one phone me back. After 7 days I decided to give them a call. I was informed that my application was decline because according to them, my name and surname does not match on the new application. I have never change name or a surname. I'm still using the same name, surname and cellphone number that I used before when I had a contract with them. What system are they using to confirm? I would maybe understand if I have never had a contract with them before because of doing Due Diligence. Can someone please phone me and tell me the real reason why they decline my contract.