you really shouldn't have!

[Saneta]

http://www.english-test.net/toeic/listening/does_helen_know_how_to_use_excel.html

2). You really shouldn't have!- please explain what does this sentence concern? and answers to it:
It's my pleasure. -- CORRECT
You don't deserve it.
I wouldn't do it.

Thank you very much!!

[Beeesneees]

See #1130 and #1131 here
It was my pleasure - said after you have thanked someone for something, means I am happy to have helped'.
_________________
Cheers m' dears!

[Saneta]

I think, it can mean also:
It was my pleasure -(you) said after somebody had thanked you for something?

[Beeesneees]

Sorry - that's what I meant: after someone has thanked you for something.
_________________
Cheers m' dears!

[Saneta]

not: after someone had thanked you for something.?

[Beeesneees]

Not in my sentence. I definitely intend to use 'has' there... it's a hypothetical situation.
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Cheers m' dears!