When I was starting in September, the same thing happened to me. Dick's sold me carbons which were too heavy for my 45# bow, and they had plastic vanes.
Impossible to trad shoot with!
I explained, to a manager at Dicks', that their archery department did not know trad equipment, and should not have sold me the arrows. Dick's refunded in full for the dozen arrows and gave me a $50 gift certificate because they had inconvenienced me !
Good customer service !
moral of the story:
Order from a traditional archery supply, and start out fresh. I would recommend The Nocking Point, in Kansas or Raptor,in Oregon.
Try to accept the loss of money, time , and effort. When you get arrows that fly right, all will be great !