Losing Buy Box to Low Prices

We have recently been experiencing issues with re-sellers offering extremely low prices (about £0.30) for our products and then charging very high (£25) delivery.

This is winning them the buy box for a couple of hours every day, and while it seems to sort itself out after a while, it is still affecting our sales and integrity as a brand, as most customers will not check who are selling the products.

I have contacted support multiple times about this and been told that Amazon cannot stop this happening as all sellers are free to offer whichever price they choose. I also read some forums and saw that a few people had some results from contacing the Amazon Managing Director, I tried this and was told to submit an infringement report, which I did and was again told that they are unable to do anything about this.

Surely there must be a way to stop this? I would understand if a seller was just offering a more competitive price than us but they are deceiving customers by charging extortionate prices for delivery.