Rochester - Open sofa

I bough a recliner sofas at Rochester in November last year and they were delivered sometime in December, Last week when i was cleaning the sofas especially the 2 seater i put my hand in between sofas and notice that i am holding a sponge then I realized that there is a part on this sofa which is open not covered . My sofa is still fairly new I cant have something like that after paying so much money

They have collected the sofa to fix after I had done numerous follow up calls on my complain