Good will gesture that ends up with pharmacy working for nothing...

Yesterday we did a prescription for a number of items for a patient...then today that same patient came in with a fourth item...
 
The problem here is that one of the items dispensed yesterday had been stopped by the GP, but had been put on the prescription in error - and the patient pays the prescription charge!
 
So, she wanted her money back...as in her mind she had paid for a product that she can't use and had returned it...??
 
So here we have another moral dilemma - do we refuse to give a refund bearing in mind the product has left the pharmacy and will need to be destroyed...and anyway we did our job and it's reasonable to be paid for our labours; or do we shred the previous prescription, dump the stock, and give her the prescription charge back?
 
The fault here actually lies with the surgery, but as usual pharmacy loses out either way - loss of good will; or working for nothing and loss of stock?
 
What would you do in these circumstances?  (Vote Below)

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