Unprofessional and disrespectful - Public Relations Manager Ninja Van Employee Review

They had been unprofessional since my first interview where the interviewer was smoking, drinking coffee and talking on the phone that kept me waiting for 10 minutes during the "interview process" (not sure it could be called an interview). The interviewer gave me a so called trail where I had completed several tasks, spending at least one week time on it without any pays or reimbursements. Finishing that trail, I received the offer but the interviewer withdrew it after I had accepted it as she said she would like to prefer another candidate with more experiences. This was really ridiculous and disrespectful because her purpose was to hire someone with junior experiences but great potential like me, for which she can pay less but maximize an employee productivity, but she reneged on our agreement after she thought what she really offered was a senior position. It was absolutely a waste of my time. Can't she consider what she really needed before an interview? And another really ridiculous thing was the way she suppressed the salary. She said she planned to pay only 2300 SGD for the position (which was a senior position) and lied to me that she had to pay for 700+ levy for a foreign employee like me to pretend she had to pay a lot (actually only around 330 or at most 550 levy). So I just argued that my bottom line was 2800 on a S Pass, which she agreed, and said why not increase the salary 2800 to 3500 so that I can apply for a E pass that will not occur levy paid by the company, which means an optimized situation that the company can actually pay the so called 700SGD levy to me rather than the government. But she just simply replied my long email with just one sentence "Do you still accept the offer ?", as same as the way she wrote to me for the interview invitation with just one sentence "Would you like to come to have an interview?" Finally, do trust me, they are not respectful at all. Long working hours (averagely 10 hours per day) with low pay could not demonstrate any "work life balance" culture. And she always text me during non-working hours and questioned me accusingly with a very rude tone. And kindly remind you who is looking into my comments, the working environment is really shabby, seeming to be a dumped warehouse. You can also tell it's a star-up who can't be trusted from that they would not set up social media platforms as they said "we are just afraid customers write some craps on it". I've never heard a good company worries about negative comments and the only reason for their concern would be their poor services unsatisfying the customers. If you want to work as a human being with essential respect, do not even send resume to this small company.