Just don’t, it’s not worth it.
Could you please clarify what exactly is the issue to see if anyone would be able to help?
Regarding FBA, everything depends on what you are selling and how well are you able to select good, profitable products for sale which proceeds will be able to cover any potential losses incurred by returns or FBA fees.
What I am selling meets all these criteria, therefore in cases of any issues, the risks and losses are minimal.
You always need to keep in mind what is the current level of Seller Support provided to sellers on Amazon and that you can’t rely on them being able to assist.