Kotak Mahindra Bank — nre account maintenance charges

Address:

New Delhi, Delhi, 110085

I am staying abroad and visited kotak mahindra bank in 2015 to open nri account. Representative there told me that they will open nro and nre account and i was never told that i need to keep minimum balance in each. I am using nro account and have balance in that as well but don't have forex to send to nre account. Now after 6 months they are telling me that if i don't keep minimum balance in nre account than i will be penalize and if i close these account then also i will be penalize. I never expected this from reputed bank like kotak mahindra.