If it's eliquid and it vapes, I don't know if I'd call it "fake' juice, it may be poor quality certainly, but it's not "fake." If shops are selling it under another brand of juice (it doesn't sound like it) it's not "cloned" juice either where they maker is trying to create a similar vape.
Given the cost, well, it's certainly possible that it has subpar ingredients in it, or is not created in a true clean room and etc. I would probably concur with Opinionated, and say that you get what you pay for, so searching for juices that seem of better quality and to taste better would probably be the way to go.
If importation is not legal in your country, you may have to work with the best you have available, but I certainly wouldn't purchase one dollar juice (not on sale, not from a manufacturer I didn't know) and expect it to be fantastic and ambrosia and etc.
I'd suggest trying some different options until you find some things you feel fairly confident it, unless you want to get into DIY juice, where you have control over your own ingredients. I don't know if that's possible where you are, but if so, raw materials would need to have whatever your equivalent of "pharma grade" is in the US.
Best of luck, I hope you can find some juices that worry you less.
Anna