Meaning of "I got my money back"

[Leejo]

English Idioms and Expressions, Elementary Level

ESL/EFL Test #10 "Funny Idioms", question 10

Yes, that's right. I got my money back and as a result I opened up a whole new can of worms because other people got their money back, too.

(a) made a complete mess of his office
(b) exposed a lot of serious problems
(c) discovered some creatures on the carpet
(d) revealed a lot of new paper work

English Idioms and Expressions, Elementary Level

ESL/EFL Test #10 "Funny Idioms", answer 10

Yes, that's right. I got my money back and as a result I exposed a lot of serious problems because other people got their money back, too.

Correct answer: (b) exposed a lot of serious problems
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I did not understand the meaning of "Yes, that's right. I got my money back and as a result I opened up a whole new can of worms because other people got their money back, too."

Leejo

[Alan]

Hi Leejo,

You asked for an explanation of this:

[Conchita]