Feel like absconding

I joined a company on wfh contract basis, they made certain claims which now after joining I’m realising were all false. Like having many employees and many projects. But I feel like it’s just 2 men who’ve created an agency set up.

It’s literally only been 4 days since my 1st working day. They are constantly texting on slack, if i’m late to respond they call me. They talk down on me, on my experience and the way I work. They gave me soo much work while giving me less compensation than my last company stating it’s a contract role and the domain is new for me but they expect me to be available all the time even after working hours even expecting me to work after hours and they want me to write my log in and log out time. They’re dumping all the work on me in the name of collaboration when it’s actually just micro management. I’m constantly feeling anxious and drained and it feels like i’ve been working here for a while rather than just 4 days. The notice period is 30 days but i feel like I can’t even survive that. I don’t even feel secure about them paying me properly after serving the notice period