Poor Technical Support at istore Eastgate.

I purchased an iphone 15 Pro in August 2024, new from istore Eastrand Mall My device’s battery has already dropped to 88% at just 350 cycles, suggesting that it may fall below 80% well before reaching even 600 cycles. I use the original USB-C adapter and cable purchased with the device. The battery warranty, as stated in the device settings, indicates that the original battery is designed to retain up to 80% capacity after 1000 cycles under ideal conditions.