The whole process is Neanderthal.
"Please note that the 5,000 Priority Club Bonus Points will be included in the Welcome Letter, in the form of a voucher code, which you can deposit online. The said Welcome Letter will be included in the Ambassador portfolio."
Last year it didn't arrive inside 3 months. I asked where they had sent it to . They confirmed to me my address - it was in Australia. I have never stepped foot on the continent. The replacement didn't arrive after 8 weeks. They couriered one that arrived in three days. And of course the second one arrived the next week. I had no qualms about using both certificates - but then they did say it was permitted as a make good.