So you knowingly purchased a knockoff bike and you are surprised that it didn't turn out the way you expected?
You gambled $2,000 and lost.
You wanted to purchase knowingly defective parts and resell the bike to some other sucker.
I'm sorry but, I don't have a great deal of sympathy for you.
Thanks for posting though. I'm sure others who might be tempted to purchase a knockoff might think twice.