Get that in writing from official email id, do not trust call words.
When I upgraded from LTF Premier to Eterna, They didn't charged me joining fee in first statement neither reversed in the 4th statement (usual fee charge - reversal process), but didn't hope much about LTF status.
During renewal they charged me annual fee and luckly I spent required spending on this card, they reversed that fee.
So, if it is LTF get that like
@Vineet Kumar got in mail and do not assume its LTF because no joining fee.