IDFC Account upgrade

Hello,

I got a call from my RM where he mentioned that I am eligible for an account upgrade to IDFC Select Banking Account. I asked him if there are any hidden charges or do I need maintain a certain Average Monthly Balance but he said there aren't any charges / maintenance charges but I was researching & in one youtube video, I got to know that I need to maintain AMB of 3 Lakhs. I have asked him the same question again on the email chain but haven't received the response yet. Hence, I wanted to know if I need to maintain 3 Lakh AMB or not.
Also if I upgrade & in the future I am unable to maintain it, then what will happen ?
 
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