How do you block annoying Yahoo Messenger Users?

Random people I don't know keep asking to add me as their contacts, how do I block them or get rid of it? Or even better, cancel my yahoo messenger? I don't even use it.

I dont want just anyone to save the conversations we have on yahoo messenger

HELP

In the new Yahoo Mail, under Options - Messenger Options - Privacy, I have 'Block all users not in my contact list' selected. I only have 5 people in my contacts list and to the best of my knowledge none of them use Messenger. Despite this, when viewing...

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