Advertising Overload -- Please Help!

About 2 months ago, I started getting ads popping up on my Home Screen and continually as I attempt to do something on my cell phone (Samsung Galaxy Note 8). I have tried to remove some apps and reinstall them — especially the ones seen in some ads…nothing works. I cannot stand it, it is driving me nuts. I have to hit back or “X” it out and it adds about 4 extra steps to get to my intended destination whether it be my email, games, contacts, phone, etc. It is so annoying, I just want to smash the thing sometimes. I want to call Sprint and tell them to get the %#*@ advertising pop-ups off my phone or I will change my service to another provider. I really do not want to change but may when it is time to upgrade which could be now!

Can anyone offer some steps to try? I need to get it to stop and soon! Thanks for your time.