Problem with screen on my iphone 4s?

So i dropped my phone the screen cracked and the screen didn't work i couldnt move anything so then i took it to a place named zagg and got the screen fixed the phone was fine for the first 3 days and then it started to make horizantal lines with static the screen works fine but what's making the horizantal lines and the static and how can i fix it if possible? Whenit first started doing it when i put it to charge it would stop but it has gotten worse

Take it to the company that fixed the screen. If they font do anything sue them. Cuz they fixed the cracked screen n messed up your iphobe.

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