Block someone so he can’t see you

Was curious if there is a way to block someone so he can’t see your sellings or posts . This question comes because another seller, that has two different accounts, is constantly looking what I sell and what I sell the he in just a few minutes post it again just a bit cheaper. Even if is an old post that is a bit higher in price that the new post. So just want to see if is possible to he not been able to see want I sell or my post as I all ready block him but still is doing this things. Thanks in advance

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