How do I make a formal complaint regarding a seller central case - 3 years and counting

I had my account banned 3+ Years and i have submitted well over 25 appeals. I worked as a VA for another amazon seller and then decided to set up my own Amazon business. His account got banned after i left and they immediately banned my account without warning or asking.

I have supplied lawyers letters, bank statements, companies house documents! They still won't open my account or state why or give the reasons as why they are still rejecting

I want to escalate to another level as account health team keep sending me round in circles.