Would you regard this as bad customer service?

We have this sandwich bar in Ireland called O’Brian’s Sandwiches. So I decided to get a take away from O’Brian’s on my lunch break yesterday. They have a deal that for €6.75 you can have a toasted sandwich and soup. The toasted sandwich is ham, cheese, tomato and onion. Only I don’t like onions. When I was there on Friday they let me have a different filling instead of the onion.

But on Monday when I was on my lunch, they refused. The server said, “No, the deal is strictly ham, tomato, cheese and onion.”

I asked her if I could simply pay extra for another filling and she said, “No, if you want to pick the fillings you’ll have to pay about €10.00 because it won’t be the special offer.

I wasn’t going to argue with her any further so I just took the meal deal with no onions (having nothing instead of the onions).

I know its not a big deal, but things like that irritate me. They irritate me because I work in retail and I go to the ends of the earth to make sure my customers are happy, and I can’t understand why all customer service establishments cannot adapt the same ethos.

What are your thoughts on this?