Client Gets Big Bill from PDP Company for Under-Charges

Anyone ever have this happen to a client? I recommended my client change from a company who he had his part D plan with for various reasons, suffice to say, he just got a bill in the mail from the company for $750, because he was undercharged for his drugs, which had been paying for - right at the end of AEPish.

Seems kinda odd, not sure if he should appeal this some how. Any suggestions would be appreciated, thank you.
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