You can open a support case with Amazon by logging into the AWS console, clicking Support in the upper right corner, and choosing Support Center, or by going to this URL: https://console.aws.amazon.com/support/cases#/
From there, click the Create Case button to open a support ticket. But you need to have realistic expectations.
It's not really realistic to expect Amazon to request delisting every time one of their addresses gets blacklisted. They have lots of IP addresses, some of which are always on blacklists, and if they do nothing, the listings eventually disappear. It's not really in their interests, or in yours, to pursue this aggressively because of how modern blocklists work.
Nowadays most blocklists like SORBS use automation rather than manual listing. Generally, an address gets automatically added to a list because it is detected sending spam, and the listings expire after a period of time. So if no more spam is sent, eventually the block simply goes away. Usually only extreme cases result in permanent listings.
Since delisting happens automatically, someone who accidentally sends spam, or who is falsely reported, usually will be affected only temporarily. Someone who keeps it up will stay on the list as long as they continue.
It is possible to request delisting, but there is a caveat: if you request delisting, and your address is then found spamming a second time, you may be penalized with a longer listing period, or even a permanent block.
In other words, unless you're absolutely sure nobody else is sending spam from your address, asking to be removed can end up hurting you instead of helping you.
Unless you're paying Amazon for a dedicated email sending IP address, you are not the only person using that address to send email. That means you could get it delisted, and then someone else could spam from it again, relisting it, and you could be penalized.
If you ARE paying Amazon for a dedicated IP, then you're responsible for managing the address reputation yourself, since any blacklisting happens as a result of your own email sending practices.