RUDE CALL CENTRE AGENT

I just received a call from some or other call centre agent and I have three complaints. The first is this very rude habit of asking to confirm who I am BEFORE introducing yourself and the company you're calling from. I had to ask TWICE before he specified. Secondly I believe he said Cell C, but went on at such a speed I could not be sure and if he is affiliated with another company and not directly with Vodacom, WHY are all my personal details being distributed to third parties?! Lastly...the reason for his call was regarding a \special"offer. There was the usual rant about all the benefits etc"