Funny I tried to buy 250 EMH shares about 4 years ago which...

Funny I tried to buy 250 EMH shares about 4 years ago which would have raised the share price roughly 10 percent at the time. My trade failed to go through then about 1/2 hour later I received a call from ASIC asking me was I trying to manipulate the market, and to stop that sort of practice and subsequently stopping my order. I find it quite discriminatory that they would allow multiple singular trades especially at the end of the day would that effectively drops the price and no one seems to be accountable. I wonder if they are making that same phone call that I received????