anyone would have treated you like a child by this point in the transaction

the point is the second seatpost is one that you bought without measuring the frame or the current seatpost and it's the only one we know to be the wrong size, if the first was the wrong size than the first frame is their fault, if the first is the correct size than i'd say both frames are most likely your fault, it's a lesson to learn, be glad you've learned on a mercier and not a cinelli