Sadly far too many companies operate like this
Even the supervisor was a twonk. At the end of the day the best solution is to hang up. Better still register with www.mpsonline.org.uk/tps/ then whenever a call centre phones you make sure you get their address and report them. Also if you are being persistently bothered by a particular company call the police and report them as a nuisance caller they will soon stop.
( Big Ian has stopped changing his sig, Wed 9 Sep 2009, 11:11, Reply)