I Need help from veteran!

[AmaLOCK]

a competitor entered on my products..but sells different things ... cheating customers.

he had received a flood of negative feedback but now he buys his products with an account and leaves positive feedback to balance the dramatic situation of his account.

How can I report the issue to Amazon?

[rsot]

How are you certain about this?

[AmaLOCK]

Yes, 1000% sure.
Every 10 second 3-4 feedback with same name :

Carlo S.
Francesco G.

And with similar text

On 26 July 20 feedback from same name
On 27 July 15 feedback from same name