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Two 1099B for same stock
It looks like what you're calling a name change was registered as a merger that resulted in an exchange of stock.  If that's the case, then what you've been told is correct.  You've got one long-term sale and one short-term sale. Based a quick read of the Form 8937 that was filed, it looks like there were multiple entities involved in this event, more than one of which existed prior to it. https://www.mylan.com/-/media/mylancom/files/form%208937%20for%20mylan%20n%20v.pdf