Mass Effect 1 importer Utility

Is there a way to delete import saves on mass effect one on the Xbox Without reformatting my HDD?
Cause i have 2 level 46 characters and 1 58 And i deleted them on My 360 hard Drive. but when i load up the game
And select New game and when i go to choose an existing ID My 2 level 46 & 58 Characters still apear there.. and they also Apear on my mass effect 2 import utility as well and i want them gone that i tried everything

if anyone has any answers on how to get rid of them off the in game

Then any help would be Great

Thanks