Image Sizing is not working

I have seen many threads on this topic already and no exact solution.

I have tried editing the product images in the woocomerce settings and Forced Regenerate Thumbnails and nothing happens. I looked into the issue further and it seemed it may be a problem with the theme I am using. So i downloaded a plugin that alters the CSS code of the theme to allow product image sizing changes. I successfully altered the image sizes within the plugin with this and regenerated thumbnails again still nothing has happened. I have tried the processes mentioned above numerous times and even re-uploaded a new image and nothing has worked.

The image that I am wanting to change is the “Single Product Image”

How do I alter the single product image sizes in the simplest possible manner? I would prefer to not have to alter any code manually.