Copy right infringement 3rd week into selling

So I’m wondering if this has happened to someone else. I launched my very 1st product on Amazon (FBA) 3 weeks ago & began seeing organic sales come in fast. I was working on creating a brand name on the item. Not yet able to trademark it (I’ll be honest, not everyone has money available on hand, I’m a single mom with limited funds, I’m trying my best for the first time doing this, don’t judge me please.) Anyways, I got dinged for copy right infringement. Of course, Amazon gives the most vague description of what exactly it was that’s claiming copyright. I called Amazon, & they said that the exact design of my product, someone else owns the patent to it & it seems they are reporting everyone trying to sell this item. I’m obviously pissed because Amazon asks for documentation to some how prove that it’s not copyright. I asked how, & want documentation if I don’t have a trademark etc. They gave me the total run around with no solution. This other brand obviously is running the same game most of sellers on Amazon which is whole selling from China. Just to put this into perspective, we’re talking about a brush. This “brand” dinged me for a brush design. I’ve now lost my listing because I couldn’t prove it wasn’t their product I was selling. They claimed I stole their photos. Not true of course. But Amazon says they complained because the design of the brush is theirs. It seems totally unfair though because it’s like selling a battery & the “design” is round. You can’t sell it cause they patent the shape. Like what the **** do I do? If I can’t get this listing back up, I just lost my investment. Plus, amazons service to sellers is total TRASH. Which makes it more difficult.

Does any one know what to do here? Any tips?? Again I’m new to this. Maybe to experienced sellers, I sound stupid. But please I need real advice here. Any help & tips are appreciated!