What are my rights at apple store if my iPhone is being broken for the 6th time?

My iPhone is still under apple's warranty and it has been replaced for a new device for 6 times urgh, I'm going in tomorrow (some sort of purple dots showed up on my pictures taken with the phone) so my question is, what rights do i have, or if there's any at all because the phone has been broken for too many time and they always has given me a refurbished one, my friend told me i should complain about the faults and ask for 5s as compensation ( I'm currently on 5) or at least a new, boxed one, not refurbished, it sounds ridiculous asking for 5s but if i count in all the hassle and time, nerves spent on this one phone then it seems more legit… I just don't want to end up with a broken phone again after my warranty ends this august so I'm trying to find ways to solve it!

How to completely remove a song from iphone?

I downloaded this stupid song because it was free. I already restored my iphone 5c and it was gone. When I plugged the iphone to my car, it brought it back. When I try to delete it, it shows the cloud with the red arrow pointing down. How do I remove it for good?

Can you connect iphone 4 with metro PCS?

I have an iphone 4 i bought a while ago and when i first got it i had Verizon, but i don't want them anymore, because metros rates are 100x better. Can you connect it with metro pcs or does it need to be unlocked (in which i would ask can i just unlock it myself then go in to get service)