Please provide me your wp-admin and ftp access. i will solve your problem. If i am fail to solve your problem then you can ask me for refund. But you do not give me chance for solving your problem.
There is also free version of this plugin https://wordpress.org/plugins/woocommerce-to-google-merchant-center/. Without using the free version why you purchase this plugin.
The product purchase terms and condition in 4 no. issue clearly indicate “There is no refund policy”.
Again please read carefully about the refund policy http://mishubd.com/refund-policy/