Engage vs. call on

[Udai]

Test No. incompl/advan-26 "Agreements", question 6

The main problem was that the newly formed organisation was not attracting enough work and so they decided to ......... the services of a public relations expert.

(a) call
(b) engage
(c) enter
(d) register

Test No. incompl/advan-26 "Agreements", answer 6

The main problem was that the newly formed organisation was not attracting enough work and so they decided to engage the services of a public relations expert.

Correct answer: (b) engage

Your answer was: incorrect
The main problem was that the newly formed organisation was not attracting enough work and so they decided to call the services of a public relations expert.
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Why word call isn't fit here?

[Alan]

Hi,

The meaning you need here is utilise with the idae of employ. If you want to use call, then you use the phrasal verb call on.

Alan
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English as a Second Language
You can read my ESL story Phrasal Verbs/go