I know that a couple people have submitted some coding changes to help you with your website, but if you are still looking for additional help you can contact the Shopify support team to assist you further. When you are using the basic subscription plan or higher you get 1 hour of coding changes to any Shopify made theme. Since you are using the Refresh theme you can submit this request (and any others you have) to our support team. I hope this helps and let me know if you have any questions.
Have you taken a look at this tutorial yet? It won’t disable the zoom but it will make it look presentable on all devices. I believe it can be a potential solution for the issue you’re dealing with.