Sorry, but what I am understanding from your title is you were asking for no. of confirmations and you did not get a clear response from them, and because of that you faced issues. First of all as per my info all exchanges including binance, hitbtc, coinswitch, even decentralised exchanges tell you the no. of confirmations needed therefore it is not a crime.

But I am curious to know that what could be the reason that someone is not willing to disclose the no. of confirmations, since this is an open information available on blockchains for specific coins etc.