Tried changing my AAVS from BEA to Citi, but it got rejected.
Called Octopus CS up and the rejection was because my BEA top up is HK$500 and the Citi top-up is HK$250 (I don't think citi allow for HK$500 top ups).
I was told I have to contact BEA to reduce the top up to HK$250 and then re-apply with Citi or cancel my BEA AAVS, wait for that to go through and then re-apply with Citi.
Have to wait for the letters, go to MTR station to initiate the cancellation, re-apply with Citi, go to MTR station to initiate the application.
Grr, HK efficiency at its best.
This will be the third time I will have applied for my Citi card for AAVS (first time was rejected because I forgot I had it linked to another Octopus card that previously been snapped).