Licence key not working

Hello.
 I have updated the EM client and it asked me for licence to put in. I tried but it said that in someway I violated the EM client account and therefore to contact their team. 
So please let me know how to solve this problem.
I am a free user.

This has just happened to me too with the same “violation” . 

Hello,

In this case, you were suspected of using the FREE licence for a commercial purpose which is considered as a violation of our licence policy. We informed you with an email notification but after you refused to answer, we deactivated your licence. If this is a misunderstanding, please contact me at markosky@emclient.com with an explanation.

Thank you for your understanding.
Russel

I didn’t even get the notification.