Fair, sorry to hear that, hopefully that was due to that being the early days of refunding on steam. They only started in 2014, and monster hunter world launched in 2018. Here’s hoping my experience isn’t just anecdotal and they’ve actually improved in that time.
There’s an app, and I’m sure others like it, called Tidy Panel that lets you block notifications based on the content they have. The free version let’s you block a handful, but you need premium for unlimited. For you, the free might be enough.