2011 TOYOTA SEQUOIA Seats Problems

MY CHILDREN (5 AND 6 YEARS OLD) WERE IN THE THIRD ROW SEAT IN BACKLESS BOOSTER SEATS WITH SEATBELTS ON. AFTER PULLING OUT OF A PARKING LOT ONTO THE MAIN ROAD, I HEARD MY 5 YEAR OLD SCREAMING FROM THE BACK OF THE CAR. MY 6 YEAR OLD (WHO REMAINED IN HIS BOOSTER WITH THE SEATBELT FASTENED), MANAGED TO PUSH THE BUTTON NEAR THE SIDE DOOR TO RAISE/LOWER THE SEAT IN THE THIRD ROW. AS HE DID THIS, MY 5 YEAR OLD'S HEAD BECAME WEDGED BETWEEN THE THIRD ROW SEATS. I PULLED OVER AND GAINED ACCESS TO HIM FROM THE REAR HATCH. THE SEAT WOULD NOT MOVE BACK ANYMORE FOR ME TO GET HIS HEAD OUT. I HAD TO FORCE HIS HEAD OUT WITH MY HANDS. HE HAS SOME SERIOUS BRUISING ON THE SIDE OF HIS FACE. AFTER THE INCIDENT, I COULD NOT FIND ANY WAY TO DISABLE THEIR SEAT...

MY 2011 TOYOTA SEQUOIA ONLY HAS TWO HEIGHTS ON THE THIRD ROW HEADRESTS. THE LOWEST SETTING LAYS THE HEADREST RIGHT ON THE SEAT AND IS TOO LOW TO SUPPORT ANYONE'S HEAD. THE OTHER SETTING ON THE TWO OUTSIDE SEATS RAISES THE HEADREST ALL OF THE WAY UP WHICH IS TOO HIGH TO SUPPORT A CHILD'S HEAD. IN THAT SETTING MY CHILDREN'S HEADS HIT UNDER THE HEADREST AND ON THE METAL BARS OF THE HEADREST. THE MIDDLE SEAT'S HEADREST ONLY RAISES HALFWAY UP WHICH IS TOO SHORT TO SUPPORT THE HEAD OF AN OLDER CHILD OR AN ADULT. SINCE IT IS USUALLY CHILDREN WHO ARE SITTING IN THE THIRD ROW OF AN SUV I WOULD EXPECT THE HEADRESTS TO HAVE MANY ADJUSTABLE HEIGHTS TO THEM LIKE THE HEADRESTS IN THE OTHER TWO ROWS. I HAD A 2006 TOYOTA SEQUOIA PRIOR TO BUYING THIS CAR AND THE HEADRESTS IN THE THIRD ROW...