I am so frustrated right now because Amazon doesn't even make it easy to contact customer service

I wasn't able to even test out this product, I am so frustrated right now because Amazon doesn't even make it easy to contact customer service. I use a PO Box but when I ordered it Amazon didn't say anything. Usually if it is unable to be delivered to PO Box it pops up that I need to have it delivered to Amazon locker or another location. I didn't even get a postcard stating that it was undeliverable till today March 17th when it was supposed to be delivered by the 16th at the latest. This may not be the sellers problem, but I certainly will not be ordering another product from them! I will go to a physical store! Now I have to wait on a refund that Amazon chose to give me rather than contacting me and stating that I needed to choose another address.

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