What does "refund" mean?

[Pressman]

Test No. incompl/advan-21 "Money Matters (4)", question 3

If the department agrees that you have paid too much tax in the year, you will receive a ......... in due course.

(a) return
(b) reply
(c) response
(d) refund

Test No. incompl/advan-21 "Money Matters (4)", answer 3

If the department agrees that you have paid too much tax in the year, you will receive a refund in due course.

Correct answer: (d) refund

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Hi, Alan!
Why "refund"? Why no "return"?
Help be clever!!!

[Torsten]

A refund is a return of money.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Sultano]

what does the phrase " in due course" mean?

[Lost_Soul]

At the proper or right time

http://www.thefreedictionary.com/in+due+course

[Eslkorea]

'refund' definitely..no doubt...