How do I convince my parents to let me have another chinchilla?

I currently have a chinchilla right now and I have looked after it for more than a year now and I really want another one.I have all the supplies I need and even and extra cage.my current chinchilla is healthy and I took great care of it.i even have more than enough to pay for it.But my parents say that one chin is enough and it would be troublesome and smelly. But I can still Handle it.and ideas?

tell them that it is going against animal rights as chinchillas are social animals and require company from the same species. even ask a vet

Just say you don't want it to get lonely. Keep saying that and behave really nicely and your parents will be more likely to get you one.