My iPhone 5 screen popped out?

First about 19th Dec 2013 my volume up button and lock screen didn't work properly, they were jammed… So i went to this local stall in town where they repair phones

They repaired it 3 days later only for £30 however, they broke my Wi-Fi attena, they repaired this for free after christmas

As of 18th january my phone feel out of my hand, luckily i caught it, however the front screen feel off and broke, shattered completely… I've seem people iphone screen breaking but i've never seen a screen completely disattatch from the phone and smash

I've noticed in further inspection that, there was no screws attatch to the bottom of the phone, normally there are two screws at the bottom inbetween the charger area,
Normally if you don't have scews you need great pressure and sponger to pull it out

What can i do my screen has completel disattatched to the phone, the small repair stall didn't screw back the screws, I believe my phone is completely messed up because of this, normally if there was screws then the screen will of just shattered and it will be a £90 repair

But the screen has disatatched to the phone

Wow it sounds like whoever fixed your phone had no clue what they were doing.