I will not buy this company mobile anymore. Review on Oppo F15

I bought this mobile phone in January 2020. Within 7 days of purchasing the mobile. The mobile is delivered to my home. At The time offices of the mobile company I was given a 1 year warranty from this mobile company. Use the mobile for 3 months then one day I notice that the mobile was hanging very fast and the battery backup of the mobile was decreasing full stop then I immediately contact customer care on this mobile company. From customer care then asked me e to take the mobile to their service centre. Service centre informed me that it would take 7 days to repair the mobile and I was asked to return tu service centre 7 days later. After 7 days I went back to the service centre and returned home with the repaired mobile. After bringing the mobile home and used it for 3 days. Same problem arose again on this mobile then I took the mobile and went to the service centre again but after service centre my mobile was no repaired.