trade in phone lost in mail
I recently traded in my iPhone 7 Plus. I received an email saying it will be sent back to me because it was rejected. I received a parcel yesterday (similar to the box where I sent the phone to apple) very light in weight and one of the flap was open. when I opened the box it was empty. I tried contacting customer service after so many tries I managed to speak to an agent. he said somebody will contact me thru email to respond to my problem. what is the fastest way to contact apple?
iPhone 7 Plus