Free Fire Support Has Not Restored My Long-Time Guest Account

I have been playing Free Fire on my guest account for about 3–4 years, and I lost access to this account after changing my mobile phone. My in‑game UID is 6929382550, and my account was level 50+. The account is very valuable to me because I have spent a long time playing and improving it. This Free Fire account was always used as a guest account, and I did not link it to any other platform. After I changed my phone, I could not log in to my old guest account, and a new account opened instead. I contacted Garena/Free Fire support about this situation, but I still do not have my account back. I kindly request that my old guest account with UID 6929382550 be recovered and restored to my new device, or that you provide a clear and final solution for regaining access to it, as I do not want to lose an account I have used for several years.