Fix My Amazon Account

I own a Hisense Fire TV on which my Amazon account is linked, and I have been experiencing problems with suspicious activity on this account for about two months. Because of this situation I have been trying to get my Amazon account back and secure it again. When I contacted support about this issue and asked for help, they stated that the suspicious activity was done by me, even though all I was trying to do was recover my Amazon account and solve the problem. I do not agree with this assessment and I feel my concern has not been taken seriously. I request that my Amazon account be properly checked, that any suspicious or unauthorized activity be investigated in detail, and that my account access be restored and secured. I also ask for clear guidance on what steps will be taken to protect my account and ensure this problem does not continue.