Jio — frequent pop up add disturbance and opening webpage

Website:

www.jio.com/JioWebApp/index.html?root=primeRecharge&header=no&utm_source=mm&utm_medium=b

I am no longer a jio telecom customer still i am receiving popup full screen display add no matter what i am doing on the phone. If i touch the screen even to close the add it will open up a web page to recharge. I initially thought it is because i have jio apps in my phone and then i uninstalled every jio owned apps. Still it is poping up every now and then amd causing lot of disturbance. I am no longer jio user because of low network coverage at my area. If you are reading this kindly stop doing these types of miscleneous malware activity. People already like you for lowest price packs and you guys was the real reason every telecom company reduced their pricing thats excellent. But please don't disturb.
Thank you
Jithin