I've only encountered this 2 or 3 times earlier in the year but since then was all good. No issues receiving bank codes etc.
But last night I was trying to log into Paypal, they sent verification code but after repeating few times, it never arrived. I thought it was Paypal issue but then I provided my mrs Spark number and it arrived straight away.
Has anyone encountered this before?
Kogan is just an MVNO under Vodafone NZ. You shouldn't have any problems receiving short codes but you are sweet out of luck if you ever want to reply to them as that is not supported. Looks like it's worked for you in the past so may have just been a Paypal or Vodafone issue at the given time?