Have Not Received Part of My Rebate

i went to office depot and got my norton's antivirus.It had a $30.00 refund from nortons which i received and then another $20.00 one which i never received.The norton's antivirus should have came out to 19.99 thru the refunds but somehow i got screwed.Does anybody know about these refunds and how am i supose to contact them on this matter?

  I would greatly appreciate it.I bought this in Dec.2010.

                                                                                                                                  Thank you,

                                                                                                                               Sharon V.

 

[edit: updated subject to reflect new thread]