I bought something, seller from China sent wrong item, it's not worth the effort to send back for 250 baht, i go for a refund based on not sending back to China, delay in it being approved so i tried giving a 1* poor review, refund gets approved within the hour, of course the review now disappeared which is why the refund was given.
Anyway a good option to try if you don't want to send back.
This may work if someone only had a limited number of reviews already, if they've had 1000s, they won't care as it won't impact the % much or at all