I'm kinda new to the job market and I'm basically only working to get some extra money as I'm currently in the last year of university.
At this moment I'm freelancing for a company and I signed a contract that states that it's both at-will employment and that my position is project/contract based. I'm currently in the middle of a pretty big project (architectural visualization) and unfortunately, I feel like it had some major work added to it. The number of buildings to make has changed, and so did the number of environment details I need to make etc. The worst thing about it is that my employer hasn't been responding since the beginning of this week (they had an excuse but still it feels quite unprofessional). I need information and clarification from them but I feel straight up ignored as they are not providing me with it. Architectural plans I got from them are outdated (stuff doesn't match because the architect decided to do some changes) and I'm basically working blindfolded because I don't know exactly what they want. It's a waste of time because it so happened that I spend a few hours working on a certain area, adding greenery etc. only to hear that I have to change it because they want different plants even though I asked thme for a list of what species they want and they never have made one for me.
The last thing is my payment. It was my big mistake because I started working for them when I was in need and thus, I've set the price for my services at pretty reasonable (that's a euphemism) level. With that, I completed the first project for them, got paid and was happy with my money. Great, but the amount of money I'll charge for the project I'm currently working on was calculated before the first one (it's kinda messed up but the project I've completed was more important one so we paused the one I'm working on now). Of course, we've negotiated and made some adjustments but with me not being sure what's expected. And they're telling me that now, we can't really increase my payment even further (as I feel would be appropriate considering the scope of work I did not expect) because the client has already accepted the budget.
So now the only question is whether or not I can quit right now? Because I'm just sick and tired of this lack of cooperation, and the money I'd get for this project doesn't motivate me either. And what do I do? The contract says that I need to give them no less than 30 days notice. Do I still have to work for them for 30 days? Should I send them what I've made already so that they could give it to the person that will continue this project? Can I demand any compensation for what I've done already?
Thank you in advance for your help!
Edit. I'm from Poland and the company I'm working for is based in Canada.