I've been finding it very frustrating recently to deal with preauthorization and pending charges in that many phone agents don't know how to identify them and are very confused when you ask whether something has posted as an actual charge or not.

IMO the OP should check very carefully for duplicate receipts with different ticket numbers in email and by searching delta.dumb and the Saudia website. It seems unlikely, but just in case two tickets were issued, it would be better to deal with this before the flight. Assuming that there hasn't (yet) been any schedule change or other reason for a reissue, there should only be a single 006- ticket number which is the same number on every piece on documentation related to the trip.