Yeah, well there definitely isn’t a requirement for third party sellers to weigh the parcels - in almost all instances the shipping weight field is just calculated based on the packing list and known weights for each item and the packaging material. All large Amazon sellers I’ve worked for did this.
An exception to this is if it’s shipped by Amazon, as I believe they have in-line weigh scales.
Amazon as a company though is almost impossible to deal with if you need to do something outside their regular processes or procedures, and they are heavily bureaucratic from an external perspective (including to their ‘partners’). I suspect you have unfortunately reached a block on their internal flow chart that says “no refund” and the customer services operative has very little discretion to do something different.
It was fulfilled by Amazon, so hopefully at whatever end of this they figure that out and realize they've made an error. I have certainly hit that point, for whatever reason :/
An exception to this is if it’s shipped by Amazon, as I believe they have in-line weigh scales.
Amazon as a company though is almost impossible to deal with if you need to do something outside their regular processes or procedures, and they are heavily bureaucratic from an external perspective (including to their ‘partners’). I suspect you have unfortunately reached a block on their internal flow chart that says “no refund” and the customer services operative has very little discretion to do something different.