I had a similar experience; used to have 4.8+ rating on Upwork, then accepted a job which went bad largely due to poor and inaccurate spec provided by the clien

I had a similar experience; used to have 4.8+ rating on Upwork, then accepted a job which went bad largely due to poor and inaccurate spec provided by the client. He actually went to my company website, found out the team members' emails and sent a message to everybody castigating me. I basically begged to him to stop doing any further damage. Upwork always give their clients the benefit of doubt because they know they'll always have a cheap source of freelancers from countries where living cost is low.