Send them a registered letter informing them that you received a component that you did not request, and that they send you a postage pre-paid box to send it back to them. Give them 3 weeks to do so.
By doing that you are staying within the letter of the law by requesting that they pick up their unwanted item, so they cannot charge you for it. However by using less than conventional tactics they may not get back to you in time.
Normally I don't advocate taking something that isn't rightfully yours, but in the case of having to send something back so many times, I think it's good that they sent you a bonus for your trouble.
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