It would be on your email confirmation from when you first purchased the tickets.
If you purchased a ticket that didn't say obstructed view and they added it later, you might have an argument... depending on what the fine print says. That's your best play at possibly getting some sort of credit, although it would ha e been a lot easier for you if you had called before the show when you first noticed it, not after you already attended.
Don't try arguing that the seating chart flipped, because it didn't, and you'll lose your case before it even begins.
If you purchased a ticket that didn't say obstructed view and they added it later, you might have an argument... depending on what the fine print says. That's your best play at possibly getting some sort of credit, although it would ha e been a lot easier for you if you had called before the show when you first noticed it, not after you already attended.
Don't try arguing that the seating chart flipped, because it didn't, and you'll lose your case before it even begins.