Mic not working in calls and sound recording

Hi guys. Really hoping someone out there can help me. I don't know what I did to my phone. First it was having problems calling where the call would cut as soon as it dialed, it wouldn't even ring once. Then the mic stopped working. So I did a factory reset. The calls work now but the mic does not work. I get it to work sometimes but mainly it doesn't. I had rooted it with kingroot earlier so I tried unrooting but I am not sure if it works. When I use the app to check root status it says it is not rooted properly. But my droidwall app which uses root still works. However file explorer with root does not work. When I access engineering mode my mic level is always on 0. I change it but it keeps reverting back. My video recording works and it does record sound. Really not sure why the mic won't work on calls or on sound recorder. I tried under diagnostics also doesn't work. My software updates also fail to run. When I run superuser it says other applications like it are installed, when I try remove it it doesn't work. I ran an antivirus scan and it found kingroot as a problem but I can't find it under apps to uninstall. And on the anti virus when I click to uninstall it it says failed.

My android version is 5.1 and Model number is E5603. I am scared to return it to the store because I'm no sure if its still rooted. Any help will be highly appreciated

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