Fitbit fitness device

My fitbit HR went faulty last year and was replaced in January 2021. On 28 May I requested help via the live chat as my device refused to sync and connect with my phone. I was the informed on email the device will be replaced. All my details were requested to ship the device. After several emails I was informed in writing on 30 May they made an error and will not be replacing my device but I should purchase new device. The new unit only worked for 4 months. I have read so many bad reviews on this website and no response from the business.