If you had a "poor customer service" experience at a restaurant, would you do the online survey and tell, or just let it go and forget it?

I was in Boston Market yesterday and got a small soup, a side and a cornbread. The cashier offered me a cup so I could get water, because I did not get a drink.

Because yesterday’s experience was easy and satisfactory, and I was shopping in same area tonight, I decided to go back to Boston Market. I had the receipt from yesterday in my handbag, and looked at it before going in, and I also counted my cash in my wallet.

I got a small soup and a side, and the total came to over $7. I paid with $20.02 and then looked at the receipt and checked the prices on the board. Soup was $3.50 and side was $2.30. I called the cashier over and told her I didn’t understand why I was charged over $7 when the total did not add up to $7. She said she gave me the combo price and if I paid separate it would have been more. I said how could that be when $3.50 and $2.30 does not add up to $7 and change, even with tax. She asked if I wanted her to ring it up again, and I said yes. She then handed me my $20.02 back. She should have just returned my $7 and change. Anyway, she rang it up again, and it was the price I expected, not what she said it would be. She did not offer me a cup for water.

I did not realize until I went to the store after this, and counted my money and thought more about the Boston Market experience, and I realized that I had more money then when I started.

The receipt has the “take the online survey” thing on it. Should I do it and say that the girl can’t add, she can’t give change (giving me back my $20.02 instead of just the $7 and change), and one day the cashier gives out a cup for water and the next day the girl does not, so it’s inconsistent, plus in addition, the girl was not friendly or helpful in any way, although I did get a free dinner?

Do you think Boston Market should know that, or should I let it go?