Very disappointed in experience with Apple, IStore and Telkom

Very disappointed in experience with Apple, IStore and Telkom, received a iPhone 15 with my Telkom contract 10 months ago and glue between sides and back of the phone is already coming loose. Telkom wants to send my device away to repair, IStore charges R250 to repair even though device still within warranty period. I honestly do not understand how selling a bad quality devices needing repairs with in the first year is acceptable. I would have expected a replacement and repair after a year for a device that cost R20 000