MobileCore support doesn't reply

Hi everyone,
I have issues with mobilCore mediation in AdMob.
Ads never show.
I don’t know why, I followed their docs and I contacted thier support.
I sent them screen shots of my admob settings and posted my code too.
But there is no answer from them for 3 days now.
At the beginning they where contacting me 3 times daily asking me to start monetizing my apps and when I started to work they disappeared.
Anyone using them with admob mediation?
How do you implement it or how do you get it to work?
Thanks in advance