Wow, that is truly unfortunate. I agree that the pearls are not a good value even at $200, that would still be $10 per pearl, and hope you'd get your money back on them. Yeah, for most of us, that is lots of money. It's worth a try, contacting the seller and see if they will take back, but if the strand has been split up, I can't predict what they will say. Good luck. Especially when buying wholesale, we are expected to know what we are doing.
I had similar experiences when I was first buying, such as white pearls with white dull spots which are signs of over bleaching, and tiny hairline cracks in a 2 strands of expensive large flat petal keshi similar to yours, caused by clamping too tightly when drilling. Which my buyer spotted, of course I refunded her money, photos are somewhere here on the forum.
My solution now is to examine pearls carefully under good light and with my 3.5x craft glasses on. If pearls look good for the money then, I know they'll be even better to the naked eye. (Yes, I'm old and the ************ glasses 3.5x make it possible for me to make jewelry all day.)