If you mean that it rubs for about 1/4 turn of the wheel then that sounds a bit like the disk might be bent. Lift the wheel off the ground and give it a spin while you look along the edge of the disk to see if it wobbles while it is turning - it shouldn't! Assuming that you didn't buy the bike mail order, could you pop back to the shop with it to get them to take a look at it?
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