phone glitch

I have had the screen replaced on my phone today. Before handing it in for repair, it worked perfectly fine. After picking it up from the repair shop, my phone has started to glitch. When I try to swipe up on the home screen after unlocking it, nothing happens. So I try locking it then unlocking. Then, all of a sudden it starts glitch like mad with the screen moving up and down. When I eventually get to the home screen, random apps start opening up without me touching them. I've tried resetting the phone settings, however that didn't seem to work. I'm in the process of doing a factory reset, so I hope it works. However,

if it doesn't then I don't know what else to do. I don't have any warranty with it.

Can someone please help?