Demonolatry is basically worshipping demons, Belial is going to keep taking what you give and ignoring your polite requests because that is, in general, how he rolls with most people.
Have a look at our first encounter: Rosier goetic ritual - #9 by Lady_Eva
Once you read that, take a look here, this is up-to-date though needs a few things added, but the basics are covered: My "Belial Files" : 2017 Update
I like Belial a hell of a lot and have even white-knighted for him online, in the past 
so I’m not saying don’t be generous, BUT you can’t pussyfoot around, you need to man up and show him that you’re worth his time and attention, that you have some fire in your belly. 
The “fuck you” within is the magician’s true staff of power. That’s why a lot of us come from bad backgrounds or have strange lifestyles, we may not be perfect ascended beings, but we have the “fuck you” down pat.