Go to "eBay help" at the top of the page and scroll to the bottom for contact options.

Looking at the feedback I don't see any grounds for them to be removed, I see you already have 130 revised feedback so I would have thought you would know the process for feedback revision.

Judging by the negs and neutrals you've got a lot of your problems are with the couriers you're using (Sendle?) maybe you would be well advised to use AP instead of the cheaper and less reliable alternative.