I give first and last name when I call a service and HATE it when people use my first name, or comment on the spelling (I often have to spell it). And I am not a "miss" either. I will accept "Your Ladyship", "Ma'am" or "Mrs X", but NOT my first name, especially when it is mispronounced. Incredibly rude.

Doesn't take much for me to relax, but if I can't even see you then NO WAY should you be using my first name. (Accept it only from people with avatars here LOL.)