Hydro Flask28 OZ All Around Tumbler White

Can any provide a Customer Support Email of Amazon? Need to inquire about undelivered items which has yet to be refunded for almost a month. Thanks.

Do you need to take the lid apart to scrub and clean? Or is the dishwasher sufficient?

does this keep coffee hot or warm after couple hours?

Do the different sizes nest/stack well? 12oz in 20oz? 16oz in 28oz? Or all 4? Any photos of this? Trying to compare how Yeti sizes nest / stack too.