How to uninstall/prevent to install dummy account without formatting Android Mobile?

[AC Question]

Somebody is repeatedly installing dummy account in my phone. I have formatted my phone so many times. But whenever I come Online that Dummy account again installed. I have changed my gmail id and mobile no. so many times after formatting my phone but I cant stop it from being installed. Help me to prevent from being installed this Dummy account in my phone.

 

[B. Diddy]

Welcome to Android Central! Which phone? Where are you seeing this dummy account?

 

[Sushant Kumar Prusty]

I am using Lenovo K6 Power.and that dummy account(sync adapter) is showing at back up & reset option.Here all the login account names are displayed,like Google, Facebook,WhatsApp,etc.

 

[B. Diddy]

Do you use any kind of PC sync programs to sync the phone with your computer? If so, that Sync Adapter account might be used for ir.

 

[Sushant Kumar Prusty]

No I am not using any type of pc sync with my phone.this sync adapter installing through play store.i have disabled this play store app, and no such dumy account is coming now.