In that case, if we can't withdraw our votes then I foresee never being able to vote again. Unless I buy new accounts!A streamer would be jolly incorrect in that case - the only way you get votes back is by one of your issues being marked as fixed, or by de-voting them (which is done by clicking the “voted” popularity triangle on the report).
I always find it worth checking “My Issues” after an update to see if any votes have become available, and if any of the voted issues have been fixed but not marked as so.