Discount code for a play

I just had an extremely frustrating conversation with an agent from AARP--whose name I couldnt understand and I wound up hanging up after 20 minutes.

I had called a local Theatre to make reservations for a play:  Gateway Playhouse in Bellport New York.  

The person on the phone at Gateway told me that I can get discount tickets through my AARP Membership.  But I need the CODE.

I tried to explain this to the AARP agent.   She kept asking me if the person at the Playhouse told me the Code.   I said he didnt.  He told me I have to get it from AARP.  If he had told me the Code, I wouldnt have had to call AARP.

She looked it up and said that Gateway Playhouse wasn't coming up. She said she would ask someone else.  We went round and round!    I waited on the phone for 20 minutes and then finally asked her if someone from AARP could call me back.  She said they dont do that.  I am at a loss here.    Can anyone help?