help My Apex account has been banned

I was banned in February. I didn't log in until the 20th of March. Only then did I find out my account was banned. I sent three emails but still couldn't figure out why I was banned. They told me it was because of cheating, but I checked my login records and found that I only logged in three times from January to February. I also asked for help from the customer service, but they didn't give me a specific reason. I have no idea which match I cheated in or when. My career score of 1700 is quite ordinary. I've had this account since the game was launched. I really don't understand why I would cheat to ruin an account that I've put so much effort into. But the customer service didn't reply to my emails with a detailed explanation. I just want to know which match it was or if it was because of my device. I only have one device to log in with. I want to ask them to verify my device, but they won't reply to me.