Betfair free bet

I sent a link to a friend last week who was going to join to let him know that the £25 free bet for both of changed to £10 on 1st Feb. He emailed me today to let me know that that he was offered £10 free bet if first bet of £25 lost!..I ph. BF and they said they changed offer y/day!! I googled offer and came up with £20 free bet on their official w/site!!.....https://referandearn.betfair.com/en/home