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If doesn't or didn't Which is correct ?

What is the deadline to contact if the refund doesnt arrive

Or

If the refund didn't arrive?

28 de mar. de 2019 6:25
Comentarios · 2
1
doesn't
28 de marzo de 2019
1

The best tense to use here is the present perfect.

... if the refund hasn’t arrived?

28 de marzo de 2019