@Méjeaan0 I noticed you have cancelled 3 upcoming reservations because of the payment problem.
I know you need to find a solution for this issue, but cancelling confirmed reservations is going to hurt you as a host while really doing nothing to encourage AirBnB to send you payments.
(Not to mention also cause some inconvenience and confusion to your guests.)
Sending an invoice to AirBnB would do nothing but waste a stamp and some paper.
You say you have been in contact with AirBnB about the missing payment. What did they say?