MFairy Woman's Low Heel Vintage Lolita Shoes Cute Bowknot Mary Jane Shoes

Are the blue shoes sky blue/Robin's egg blue or more of an aqua (with a bit of green)? Thank you!!

Can you slip your feet in without unbuckling them?

What material is on the inside?

How can I get a receipt and return information for the silver shoes just delivered yesterday - 3/31?