Please check that the performance and day you have booked for has a valid ATG+ offer(s) attached. These can be found in the brochure or online here
If you are not logged in to your ATG+ account before choosing your seats, the discounts won't apply and you will still be charged a transaction charge. Please see the ATG+ Transaction Charge FAQ for more information on these.
If you have been overcharged, please Submit a Request.