Upwork is 10 millions time (maybe 20 millions time) better than freelancer.com
Dude freelancers at freelancer.com use some kind of bot to auto bid on every single projects. They wont read it. When you award it then they would read the project description. They either outsource it to some one else or deliver a crappy service in order to get some part of the project amount.
They are good only for cheap logo design.
Dont be shy to charge back, Freelancer.com wont fight it, Their bank know how terrible they are, They know it too.
I had something similar to your case, Not only I asked for full refund, I demanded something for compensation as well. Freelancer.com ofcourse denied to give even the refund. I charged back my whole projects even those which were completed as a punishment to these mother ***** and yeah after a few months my credit card company reverse all 3 transactions back to my bank
Dont show any dignity to these fraudsters, show them force and they will behave