Why is my account at Crakrevenue locked?

Why is my account at crakrevenue locked?
I send real traffic, I'm a newbie. I'm learning in IM and i get over 60 $ by lead pps and ppl.
After that I received an email saying my account was locked and my payment was suspended. There was no warning before …
What do I do now? And the policy at crak is to terminate the account is not high quality?
Sorry, my english is not good.