Spec? Level?
If you are crafty, you might be able to have them silence you right after you get an Ice Barrier/Block up, so that way you can take some punishment before it (silence) wears off. Then it'd just be a straight up fight.
If you can't....oh well. Haven't had too much experience dueling a Belf to really notice how much of an issue it would be. Come to think of it, it hasn't happened once to me, even against Belf Mages. They probably just forget they have the talent...
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"Do you know what "nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible c*** : me."