How do we clamp down on fraudulent sellers?

Dealing with competition is part and parcel of the game. Dealing with bad competion should not be. This seller has fabricated loads of 5 star reviews and its very obvious. I have reported to Amazon 4 times and nothing has been done. The seller usually lowers price to become featured offer but is hurting the product due to sending damaged/used goods out at new, the reason they can constanstly lower price.

The reviews are also so clearly fake, tbe same account as left them all. The genuine reviews are all bad so i see why they have done this.

https://www.amazon.co.uk/sp?ie=UTF8&seller=A2VNCQG4OJXFN4&asin=B01NBMMVG7&ref_=dp_merchant_link