If you already got ypur ears piersed at claires but they got swollen can you go again but bring the same earrings and get your ears piersed for free?

No You are kidding your self if you think they will do anything for free. They soaked you for the studs to start with, that's why the piercing was free. They legally can't use your studs again because the studs must be sterilized and they don't have an autoclave to sterilize the jewellery. So you will get stuck paying again for an new set of studs. Best bet go see a professional body piercer and you won't have issues at all.