After taking payment over the phone using a card machine

Client: Can you email me the receipt please?

Me: I can scan it in a send you a copy within an hour.

Client: No… If you could just email me the original receipt.

Me: But it’s a physical, printed receipt. I would need to send it via the post, or you would have to collect it.

Client: I don’t want a copy of it! I just want the receipt emailed to me. We always get it in the post anyway, email is just faster. 

Me: I have the receipt printed from the card machine and sitting in front of me. I can scan and send you a copy in addition to putting the original in the post. 

Client: Fine, be fucking difficult and just send it in the bloody post.