Inderal lady who does not remember our conversation

An old lady comes into the pharmacy and asks me if I have Inderal 40mg. I said yes and she gave me the prescription to get it dispensed. She's about to pay and then realises its $9.25 (concessional price) and comes back to the dispensary and asked me why she's charged that price coz she's a pensioner. 

Me: "This brand is more expensive. On pension card, you have to pay this price."

She: "But I always get it for $5.90."

Me: "You have always paid $9 for this brand before. $5.90 is another brand."

She: "Ok can you change it for me? I want the other one for $5.90."

Sure so I have to find her script and amend the script on the system to Deralin 40mg. I give it to her and then she freaks out: "Why you give me this brand? I don't use this. I want the Inderal!" 

Does she have dementia?!??!?! No idea.

Me: "Ummm I did give you Inderal remember? You didn't like the price so you wanted the $5.90 brand and you told me to change it for you.?!?!?!?!

She: "Nah I always take the Inderal brand. I don't want this."

Me: "The Inderal is $9 - you said you didn't like the price."

She: "I don't mind the price. But I don't want this brand. Just cancel it for me please."

Me: "Ok do you want me to change it back to the Inderal brand then?"

She: "No don't worry. I got some at home so I can get it later. Just cancel it for me."

**FACE PALM**

Why did you come into the pharmacy in the first place to get the prescription filled if you have plenty at home?

Why did you tell me to change from Inderal to Deralin if you know you only want Inderal?

Why did you complain about the price when you're happy to pay the $9?

Why did you waste my time to a) first do the script and b) amend the script and c) to cancel the script? 

Why did the doctor not diagnose you with dementia yet? 

Grrrrrrr