Last few batches have rocks in them

Would have given these 5 stars 2 weeks ago - I've been subscribed to get the chocolate sea salt bars every two weeks for months. But, the last batch I received had rock-hard what may be nut shells chopped into the bars. Whatever these nuggets are - they are dangerous to bite down on. The first one I thought was an aberration, but there has been at least one of these rocks in the last 5 bars. I hit one nugget with a hammer and it did no damage.

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