Incorrect Gym bill - waiting a week for Multiply to contact me!

I raised a request via the Multiply website as well as with the contact centre agent last week Tuesday regarding my incorrect gym statement for December. To date no one has contacted me. The gym statement was discounted incorrectly. I was discounted only 10% as some sort of reduced discount even though my average visits equates to 30% as per the Visit Discount Table. Furthermore, my fitness assessment only expires on 31 December 2017 (I received a sms from Multiply stating so) which is another 20% discount but the statement has it as 0%. That is a 50% discount as opposed to the **************** that just happened.