The golden rule is that if someone phones you give them nowt and ask them for a phone number so you can ring them, if you want to!
Fucking kids of today,eh. ;)IIrc, it was your 66th not long ago - there's months in it, as mine is in April - kid!!
Dont like cold calling, sign up for TPS, its free and if the cold callers are set up correctly with a modern telephone exchange system, then they wont bother you, if they arent set up properly then its a very good sign they are either a very small company at best or dodgy as fuck at worst.
http://www.tpsonline.org.uk/tps/index.html
Weird that I am registered on there and I still get those type of calls from time to time.