Car Front Rear Seat Cover Velour Leather Cushion Backrest Protective Mat For Mercedes Benz AMG A C E S Class W205 W212 W108 W2042FE

Hello, why did I only receive a cover for one front seat and only the backrest in my order, and where is the rest....???? I think it should be a set for all seats with seat bases and backrests, so, I am politely asking why this is the case and what happened??? I only received a cover for the backrest of one seat and nothing more!!!! Please explain this to me. Thank you and regards. I am sending a photo of what I received.