Best answer by woz
vouchers are usually issued a couple of days or so after you've switched, I don't think all are processed at the same time, so you can't rely on that as a reference; ask your friend to check emails give it 3 or 4 days after your switch date, if still no voucher if friend goes to wattbot and types where is my amazon voucher the bot will guide them through.
Have become a Pure Planet customer having followed referral from a friend. I have received my £50 Amazon voucher, but my friend has not received hers (the offer was £50 each in vouchers upto 31.07.2019). Are the vouchers issued at the same time?