First, try to negotiate on what's being delivered. there's lots of ways to cut corners and cut down the amount of work that's being done. don't be afraid to take on technical debt, if that's the company's attitude. Look for ways to reduce scope and cut things down.

and if that doesn't work, you just go on working at your own pace. they may or may not fire you. It's not the end of the world if you do. You'll always be able to get another job, that's how capitalism works. it's all part of the regular life cycle of getting a job.