Device set to custom after screen repair

<p>My phone - Galaxy S7 Edge - was send in for the screen repair</p> <p>Service was quick and I got the device back within a week</p> <p> </p> <p>After installing some applications, I noticed that a security warning keeps popping up and I was unable to install Netflix</p> <p> </p> <p>Trying to do a software update (thinking that this might be the problem) was met with a warning - "The operating system on your device has been modified in an unauthorised way"</p> <p> </p> <p>Quick search on the internet indicates that this is due to the phone being rooted. I have never rooted this device and all was working before it was send in for repairs.</p> <p> </p> <p>I contacted their support and they adviced I have to take the unit in again - At a cost of having to drive there again and being without my device once more. This is totally unacceptable as I was not at fault.</p> <p> </p> <p>For the inconvenience, I expect them to come to me and collect at their cost as this is due to something they did. </p> <p> </p> <p>Job Card: ********** 1</p> <p> </p>