Need urgent help for importing csv file

I uploaded a 2000 reviews csv file but it got stuck in between while uploading so i had to cancel it.Then it stuck on cancelling so i waited for some time but it did not cancel so i had to close the window.
So now i try to even upload a 1 review csv(test file) file it gets stuck and instead of uploading test file it still uploads the old 2000 reviews file.Every time i run test csv file old files reviews start uploading.

How to reset it so that i can upload my reviews. I have tried deleting the plugin and reinstalling it. Need urgent help took me days to prepare the csv file.

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