Parzival
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?

Mar 28, 2019 6:25 AM
Comments · 2
doesn't
March 28, 2019

The best tense to use here is the present perfect.

... if the refund hasn’t arrived?

March 28, 2019