Sapphire Systems App Developer interview questions

Phone screen with HR and then a technical assessment that I never heard back from. If they are going to waste my time, maybe a 30 second rejection email wouldn't be too much to ask for? Despite 3x follow ups and being told in interview I'd receive in depth feedback following the technical assessment, I've heard fk all. I'd avoid this employer unless you enjoy wasted time and a crap recruiting team.