HDFC Ragalia gold annual fees charged even though it was sold as LTF

HDFC Regalia gold is never free for any customer. 

Did it say Nil charges or something in the welcome letter? If some charges were indicated, did you confirm from customer care if it was a paid card? If you have either, then there might be a case. If not, merely with screenshots at the time of applying, it'll be tough.

they sneakily mention spend amount to get the card free below the zero. 

Screenshot will only work if you are lucky from customer care 

Only if you have 2 things clearly visible in screenshot

1) screenshot clearly stating "life time free" by striking out the renewal fee, 

2) with NO FOLLOWING OF asterisk's at the bottom "*" saying "you need to spend this much lakhs" in small letters -> THIS SHOUDN'T BE SHOWN IN THE SCREENSHOT

only then you really applied for LTF or else you applied FYF

always whenever you apply HDFC card after getting it delivered and AFTER activation, call their customer toll free and verify if its lifetime or PAID CARD, else they will charge annual renewal fee on the 3rd month after activation

if they said its FYF card and you have proper proof of screenshot displaying "only life time " without "any asterik conditions below" then you can mail the screen shot to their customer service email id [email protected] and they will convert the card to LTF

Thats how I got my LTF since i had proper proofs with really LTF with no asterisk conditions

or else you are out of luck

I got my card in Aug 2023 , but i am charged 2950 in Dec statement . 

Called CC , they gave random reply that fee can be charged anytime b/w 90-120 days.