Hi @Saithx
I appreciate you reaching out to share your concern here and I definitely recognize how important this situation is to resolve. I am sorry to hear that you have felt our support team has been dismissive of your concerns, that should never be the case. We take reports of the checkout not working very seriously, this is obviously an integral part of your online store!
Have you connected with our authenticated support team to report these issues? If you have not, please reach out and share any details you may have. Including if you are able to replicate any problems on the checkout yourself, or any screenshots showing the issues customers are experiencing. To access our authenticated support, please follow this link: Shopify Help Center.