Managers decided that the support contract with one of our most important third party servers is not worth the money.

Take a guess which server caused an outage for all customers twice already :D

@retoor yes, our company sells only 1 service via different products. That server is responsible for the service that users wants to use our system.

Our API, database, ... is still working but users do not care about this if the key functionality is now breaking.

Compare it to a messaging app. you can see all chat history & all contacts but cannot send or receive messages. Users would be very unhappy.