Real quick, just before we provide your refund, have you checked out WooCommerce?:
https://wordpress.org/plugins/woocommerce/
WooCommerce is the most popular e-commerce solution for WordPress, it’s free, works great with our themes, and with the support we offer can help guide you setting it up and make some style customizations as well if needed.
Please confirm if you still want a refund.
Thank you.