You can use an app such as Airpush Detector - https://play.google.com/store/apps/details?id=com.brosmike.airpushdetector&hl=en which will show you what app is giving you these adverts and then you can remove the offending app

 

I've just searched for "leadboltapps" and it appears to be another of those advert push services that get installed as a part of another app but then bombard you with unwanted ads. From what I can see, it is a genuine company offering a 'reputable' service, but please do your own search rather than just relying on my 30 seconds of research!!! I was subject to something similar a few months ago and researched the [different] company before I followed the link to their website and said that I didn't want any more push ads from them. Since then, I've not received any. I think it's a real abuse of trust that this kind of thing exists but, provided you first make sure they are coming from a known company, I think it is safe to follow the 'opt-out' link.

 

Glad you got it sorted