I have ordered from redbubble maybe four times. Product and service has always been fine.
The time before last a discount expired just as I went to place the order. Online chat fixed that almost instantly, we still got the discount.
Last time a t-shirt was sent in a woman's fitting rather than a man's; this was also fixed instantly with a credit that I could use to buy a new shirt. We were allowed to keep the old one.
I run an online business in another field, so I'm very aware of how I get to take the blame for customs and delivery services, especially in the US, sometimes being impossibly slow and inefficient. Just saying.