Should I return? Feeling very angry! topic

Hello all, I am new to the Nexus 5. I bought mine two days ago. I was really impressed with it at first, but now I'm being told by everyone who I speak to on calls, I sound distant, fuzzy and my mic is crackling. Also, there's a few black dots on the screen. I have done some quick research and found lots and lots of information regarding this issue. However, what I really want to know is, considering this is annoying me like crazy, is it even worth returning it and getting another one? I seen a few posts on other sites and one user had returned 5 times and still had faults. I don't know if I can trust LG again. The problem is, I love this phone so much! :/ I have 30 days to return my phone because of these faults and can either get a refund or an exchange. I don't even think there are any alternatives in the £300 price range :/ I sold my iPhone 5C for this as well! :/