Well, I don't know for which specific account you were talking about but it's relatively easy to delete your Amazon account (i am talking about the general account) just go over the profile page of yours and look out for the settings and look over there you will find deactivation details somehow.
I have the same question. I considered partnering with Merch by Amazon but the software doesn't work properly, all attempts to inform Amazon have gone ignored, and support is non existent. I was treated like an idiot by someone who did not even read (comprehend) my request for support. This is not how I treat my clients and I CANNOT have them subjected to the same treatment I received. I CANNOT partner with such incompetent lack luster software and support. And yet there is no clear place to deactivate my account and I cannot take out my bank account details either. Very sketchy! I will warn other artist to steer very clear of Amazon Merch. Meanwhile HOW DO I CUT YOU LOOSE????
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