how can a group of people add me on msn in a group chat when i already deleted them?

DooDii

New member
me and a few girls were friends but due to a problem i broke up with them, on msn, i deleted all of them and blocked them, but i WAS in a group with them but i got out from it, so i have no one on msn that relates to them, how can they add me in a group chat when i deleted AND blocked all of them?
and please tell me, if you know, how to delete them so they cant add me again, because all they do is add you in a convo and start cussing the hell outta you and leave, it hurts people
 
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