Intrusive Google Play Store advertisements appear as soon as I start charging my phone I get these types of full screen ads as soon as I charge my phone:



I don't even have to unlock the screen, the ad sound starts playing as soon as I plug in my phone. In order to get rid of it, I installed a third party app called Blokada and it worked and if I see which all ads are popping up, the app says that the ads are:


app.adjust.com
mobile.pipe.aria.microsoft.com


So I guess these ads are responsible for those intrusive popups. I have tried multiple antivirus applications but none of them showed that I have any virus/malware. Is there anyway I can remove these adwares from my phone ?
It isn't a Virus. So, no anti-virus or malware scanner will catch this. 

It is just an app which adds lockscreen ads to your device while charging. These ads are set so that they only appear while charging. Some apps even advertise that this makes the device charge faster. 

Such ads are included with many free apps and you need to find out which app is showing them on your lockscreen. The most usual culprits are - Avast Anti-virus (Yes!), ES File explorer (the probably stopped now), UC Browser, Xender, Clean Master, and many other so called device booster, battery booster, CPU booster, memory booster type apps. 

I'm sorry but you'll have to figure it on your own from this point. It is impossible to pin-point a particular app because there are just so many of then which do this.