It would be better if you pointed out the mixer that “scammed” you. Without that, there is no way of establishing whether the minimum required deposit amount banner or warning was visible or not. I mean, if you were not even keen enough to recall the mixer you used, then there is a high probability you ignored the required minimum warning or worse, you use a phishing site.

Most of the mixers I know here have that minimum warning right before you send your Bitcoins.