Executive customer relations

Xfinity rep accidentally sent me 8 different shipping labels within 60 seconds for a return and their records don't indicate that I used a label that they have on their end. Their different tracking information says the phone never left my city, but the tracking information I have from my lable indicates it was delivered and signed for by the Xfinity warehouse in Tennessee. I also had a separate device that was delivered with a separate tracking number that the same day and time and by the same person. I already received the refund for the one without issues. This is a very complicated issue that cannot be resolved by the automated system or regular call agents incapable of communicating with the warehouse. Not only have I not received a refund from my sales tax from my device being returned in a 14 day window, but I may get charged for the total cost of the device if this is not resolved in a timely manner. Please help.