Straits Interactive React Developer interview questions

I was first asked to complete a task which I completed with no issues. They then wanted to go on trial(paid) with them for 2-3 months in which I did. At the end of the trial, they lowballed me after they saw my payslip (much lower then what I asked during the initial interview before the trial. They asked me for a trial period, doesn't that mean they agree to what I'm asking?). The people responsible here are Kevin Shepherdson and Andrew Fam - CTO (which also decided to ghost me of my final payment after I declined their offer. I have sent him tons of messages and got no reply.) I'm not sure how a government-required service provide can and will try up to screw potential hires up (cause Malaysian, they lowball you cause apparently conversion means something to them)