Android Game Ad Integration Fix

I have developed an android game and I am looking for including ad mobs (banner, interstitial and rewarded). However, ads are not coming including test ads. I need someone to help fix it. Technical expertise... (Budget: ₹600 - ₹1500 INR, Jobs: Android, Android App Development, Android SDK, GitHub, HTML, JavaScript, Mobile App Development, Mobile Development, PhoneGap, XML)