@Sue340 - Airbnb is an American company so you would need to contact someone in the US. There are multiple ways to contact them. Use the Tips and Tutorials discussion room to find the "How to Contact Airbnb" or use the search engine here to find it. There is a toll-free phone number in that document.
Personally I'm not sure what you expect Airbnb to do based on an error from Payoneer? They do not own that company, are not affiliated with that company, and offer it's services as a choice to you for receiving your payouts. You have multiple options for being paid, you've chosen one that provided you with the most return on your finances but seems to be lacking in customer service. It does sound like Payoneer is actually working on the problem.
What kind of "follow up" are you expecting from Airbnb? They have processed your payment and sent it to your selected financial institution and, I'm assuming, that they have verified that the monies were accepted by Payoneer.
Are you saying that Airbnb combined the monies to send one lump sum or did Payoneer load your card once with the total distribution from Airbnb? Those would be two different problems. If you could provide clarity, then perhaps we could help resolve this with you. Again, I'm assuming that in your transaction history it shows 2 payouts for the 2 different reservations. Is there something in your service agreement with Payoneer on a minimum that must be met before a payment is processed? I ask because Western Union users were able to do this to minimize transaction fees.
While it is clear that you are frustrated and unhappy, rest assured that cancelling all your remaining reservations will only net you more disappointment as you will be fined for each one. As someone who has been an Airbnb member since 2015 and a host for at least 76 reviews, payment could not have been an issue all this time or else you would have stopped by now. Hopefully you get it resolved quickly and if we, as fellow hosts, can try to help, I'm sure we will (Airbnb doesn't read these posts, so a threat to go to the media is lost).