I am refloating this thread since, suprisingly, I got an email yesterday from LATAM welcoming me to my LATAM Platinum advantages. This is interesting as I had requested the status match (from KF Gold) to LATAM in Dec 2018 and I got an email in Jan 2019 saying this was rejected without giving any reason. Not sure therefore if this is a glitch or otherwise but obviously good news. Card appears now valid until April 2020. LATAM Platinum equals to OW Sapphire so will come in handy.
Just sharing in case anyone else has had similar experiences.