When cold calling was part of my job at age 17 in a (manual trades-focussed) recruitment agency and on being given a mahoosive folder full of pages of addresses and phone numbers for local employers fear engulfed my tender heart.
Then when I saw that I was expected to call Steve Stride, the then secretary of (my team) Aston villa FC and ask him if he needs any plumbers or plasterers I thought bollocks to this for a lark, left the phone alone and just made up reasons why they didn't need any.
In hindsight 'twas a valuable lesson but at the time bloody awful.
The worst time in the year for marketing calls was when they new Yellow Pages came out in June, a bloody nightmare, I remember going into one of my suppliers to buy something and one of the counter staff was sitting at a desk with a YP open and on the phone phoning customers/advertisers.
I used to spend a fortune advertising in YP, I worked out that for every ten calls YP generated eight of them were marketing calls and each call was costing me something like £8.
I don't advertise all now and haven't for the last six years although I do have a website but it's really only an information site but it does get picked up by Google, I occasionally advertise on Gumtree (for the website/Google thing) and it really is torture but I've stopped advertising there now too as its a complete waste of time and money.