The same thing happened on this steemit account, keys are changed so I cannot access it anymore. But it could've been much worse. The thing that I found most annoying is that they posted scam with that account on steemit. I changed the keys here on hive as soon as I found out that there were some funds missing here on hive. And luckily for me that they hadn't changed the keys here ... and that I was in time before much funds were lost.
The steemit thing I only discovered today as I don't use steemit anymore, but it came to me that I should check it there.