COUNTA(UNIQUE(FILTER(

Hello all, 

I am trying to write a formula that will counts the number of unique values in Column L:L assuming there filter Sobeys and not Voila. 

The below is my formula:

=COUNTA(UNIQUE(FILTER('Iri Comp Data'!$H:$H,ISNUMBER(SEARCH("Sobeys",'Iri Comp Data'!$L:$L,ISNUMBER(SEARCH("<>Voila",'Iri Comp Data'!$L:$L

I believe the issue is that I can't use <>. The problem is in my data set in Column there is Voila by Sobeys and I don't want to include those in my count.

Thank you!