When I go to watch Netflix or prime on my virgin TV box, the sound doesn't work correctly. The voices of the films I try to watch is distorted and fast screeching noises like the noise a tape would make if you were rewinding it very fast
Have you tried changing the Audio setting.
Go to Settings > Audio & Video > Audio Output
3 options; Follow Content, PCM 5.1 (HDMI only), and PCM 2.0
Follow Content is recommended and also needed for bitstream audio like Dolby Atmos when it's available.