The plugin works as intended for RPG Maker MV/MZ at a base level for many individuals, so far all the cases I have contacted that it didn't work for were customizing the engine, or using incompatable plugins such as MZ3d, which is not MV3d to be clear, it is compatable with MV3d.
I never stated ANYWHERE that this map works for custom builds, heavily modified builds, or builds filled with random plugins, this is clearly stated as being for RPG Maker MV/MZ, without saying anywhere it is for a heavily customized setup.
And you clearly said below you were using a customized menu, it doesn't say anywhere on my page that I support customized menus. So I don't understand how you can aggressively go in here with a dispute when you are not using the plugin as intended, you are likely to lose it.
You can't force developers to refund you when it doesn't work for your custom work, when they never stated anywhere that it would work on a custom setup of the likes of yours.
And the collision detection on the walls works perfect for just about everyone, so once again, its not my fault, something in your project is not properly configured.