We started receiving emails this morning as well. After testing we verified that the first purchase went through, and then turning around to complete the same in app purchase would return "This In-App Purchase has already been bought." On the backend we are seeing that the receipt has already been consumed.

@Ana2408 did you ever get contacted or have this resolved? Been dealing with this all day, and it feels crazy to me that all this money is being lost and nothing is being done?