Originally Posted by
Fiordland
I don't think you have screwed anything up. The LATAM computer system decided to offer this flight combination to you and issue a ticket to you. If it is on one ticket it should all work.
The OP's travel agent did this not LATAM and should have gone over the pros and cons vs. a LATAM codeshare. LATAM's website would have sold it all as LATAM you can bet.