Trying to request an exclusion, or getting an answer from seller support is practically impossible, so the ONLY realistic thing you can do here is contact your local MP, and let them fight for you.
If enough MPs get messages from their constituents they may just may be forced to take an interest.
Just go to a search engine, type in "find my local MP" email them, explain what is going on, and that you would like them to help you, and for Government to forced Amazon to respond and ultimately stop this soul destroying practice of holding on to your funds for weeks on end.
No one on here is gonna help you, so who else can you speak to?
Also worth contacting any of the consumer help journalists in the tabloids, BBC Watchdog type tv programs, Martin Lewis, just anyone you can think of that has some power.
If enough of us contact our MPs and this gets brought up in Parliament, then MAYBE we can get some help.