IPhone 5c front speaker muffled?

So I just got my iphone screen and sound fixed because I had to use speaker phone when I talked to people and I just tried using video but my front speaker if muffled, the back speaker works fine but the front one doesn't. Is it possible I got something jammed in there and if so how do I get it out and if the man who fixed my phone did that then what could he have possibly done to cause this?

I and open your. On YouTube there's a video dedicated to this. Or give it back for repair in the Apple

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