Recent Business Platinum and Gold Promotion – referral bonus question

[PWWILD]

Hi.
I’m a Personal Platinum cardholder and I referred a couple of friends to the Business Platinum and Business Gold Amex cards during the recent sign up bonus promotion that ended on 8th April.
Amex didn’t initially give me the referral bonus until I queried it.
However, they have asked me to confirm what the Referral Bonus was at the time – as they weren’t sure!
They have initially awarded me 18,000 points for the Bus Plat Amex referral but I actually thought it was more than this during the promotion.
Can anyone confirm what it is for both the Business Plat and Gold cards and ideally post a link/screenshot to any confirmation of this?
Many thanks
Pete