Just contact the sales team (if not in, ask to speak to the PR duty officer) and ask them to arrange for you to collect the tickets at the main entrance gate, take proof of identity etc. They know that the tickets have been lost at there end so they can just put them at the gate for collection. Tell them that you don't have enough money to pay for them again as your salary isn't transfered until next week and "the problem is a direct result of there actions"
You might just get them tonight as they are there until 18.30
Good luck