How To Report Review Fraud?

Hi All,

Got a competitor who is doing the classic ‘combine irrelevant ASINs with poorly-rated product to get 1000 5-star reviews’ tactic. I’ve reported them through the report listing tool under the inappropriate variations option, and to Amazon’s credit they acted fast… but the seller just re-combined the ASINs.

I’ve reported ten times, the listing has been split up ten times, and recombined ten times. What should I do now?