Both responses above are good. First check to see if the scion wood(above the graft, the mandarin) is still alive, as Worth suggested. If it is, as he said, you have a chance to save it. Then you should remove the sprouts below the graft, as twillis suggested, you do want the mandarin to get the all the nutrition and energy, not the rootstock.
If your scion is not living, you could either chuck the tree, or you can leave the sprouts on, and grow the rootstock. You may be able to try grafting a new top in the future(It really is easier than you would believe, I was successful my first try). If you like the rootstock variety, you could just grow it for an ornamental.
Hope that helped.
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