Consumerist is your best course of action. I think it's unlikely they'll reinstate your account, but it's possible. Otherwise, there only thing you might get is an offer of refunds for your Kindle and Kindle purchases, but you say you don't want that.
Theoretically, Amazon should have a way to continue to service a customer whilst preventing any new purchases. But there's nothing that says Amazon must provide such a mechanism.
The fact you may have "legitimately" returned a lot of items is irrelevant. You probably have cost Amazon more money than they've made off you, and whether you're just unlucky or a hypochondriac, Amazon isn't interested in having you as a customer anymore. I agree they could have handled it better, though.