Seller Account is Locked due Unusual Activity

I am writing on behalf of a friend who is an Amazon seller operating in Canada, the USA, and Mexico. Recently, he has encountered a major problem with his account which he is unable to resolve independently, and so, has asked for my assistance.His account was recently locked and deleted from the Seller Central panel due to purported "unusual activity," as per the error message received upon attempting to log in. The message read, "Help us protect your account. We have detected unusual activity on your account and it has been temporarily locked. For further assistance, please contact customer service." Notably, this issue is affecting the visibility of his seller accounts for Canada, Mexico, and the USA on the panel.

My friend assures me that no unusual activity has been conducted on his part, and this sudden and unexpected account lock is causing significant concern. After the initial contact with your team over the phone, a form was filled out and we were reassured that the account would be reinstated. Contrary to expectations, we received a response the following day stating that the account would remain closed due to the aforementioned "unusual movements."

We believe there may be a misunderstanding or error at the root of this issue. As such, we respectfully request a thorough review of this matter and are hopeful that you can provide guidance on the necessary steps to rectify this situation. We stand ready to provide any additional information that might be required for the investigation.

Given the critical importance of this account to my friend's business operations, we sincerely hope for a swift resolution.

Thank you in advance for your attention and assistance in this matter.

My amazon email address is : [Moderator Edit: removed personal information]

i have tried contacting several time but didnot get a response

Kind regard