I encountered the same problem a couple of years ago. I contacted Beckett and went through the process. They were going to re-slab it for free, but told me the card was subject to regrade.
A few years back Beckett transferred their entire data base to a new system - screwed hundreds of graded card up - incorrect numbers, numbers deleted and assigned new ones, etc.
I was sent a form to fill out and they would re-slab the card and issue a new grading number.
The following is the text of the email I sent them and their response - this was after a couple of phone calls.
"I own a 1948 Bowman, Carl Braun rookie, card #72 that was graded and encapsulated by BVG in 2002 as a 6.5. The label has an incorrect serial number and bar code. I have attached a screen that reflects Beckett information regarding the card, when it was graded, pictures of the card front and back, and information regarding the incorrect label bar code and serial number. The correct bar code and serial number should be: 2236368 as reflected in your web site. The bar code on the label is 02236360 and the numerical data above the label bar code is 0000063100. The casing has not been tampered with and is in excellent condition. It appears to be an administrative error from 2002.
I would like to know how I should proceed in getting this corrected. My contact information and problem summary follows:"
Beckett's response:
"Hello,
Please use the form attached for the card that needs to be assigned a new serial no.
Thanks,
Jay Ryan Donayre
Beckett Grading Services
jdonayre@beckett.com
972-448-9188
2700 Summit Ave, Ste 100
Plano, TX 75074
beckett.com "
I elected to just keep the card as is. What a pain in the ass.
Hope this helps. Jim