The annoying thing is, you put in a cash back request and they simply delete it and give you a generic answer.
I am going to the commerce commission as shopback has acknowledged multiple times they are aware with temu issue but they continue to advertise it leading to sale under false pretenses, I'm not 100% sure what we can get them on yet but I'm not happy, its damaging their brand and I'm also wanting to make a class action suit, I have reached out to some legal representation. If you would be interested in joining we will need to have proof you have already tried to request missing cash back, plus all the details of the cash back.
Are you interested
NZ doesn't have 'class actions'. There is representative actions. You will need a lawyer, and expect it to cost a fair bit.
Small claims (Disputes Tribunal) might be an option.
Fees are staggered, based on the amount of money you’re claiming for:
Under $2000 - $59
$2000 to $4999 - $117
$5000 to $30,000 - $234
You can’t claim this fee back even if you win.
https://www.consumer.org.nz/articles/disputes-tribunals