BigCommerce Software Engineer - Front End interview questions

I applied online and got a phone interview. They asked me basic HTML questions. Then the interviewer told me that she would send me a assignment. I got a email that I have been added to a repository on githib. So I clicked it. There were instructions on how to complete it and the assignment was made up of two parts. Now I started doing it asap and spend a lot of time to complete it according to their requirements. After I checked the the code. I get a email from the recruitter on monday that, "Oh sorry! I forgot to send you the challenge.. here is the link.". When I clicked the link it was a totally different exercise. I was really angry on them because I wasted nearly two days on that exercise to make it perfect. So, I requested the recruiter to consider it as it is their fault. She said she would send my exercise to the hiring team. I followed up after two days and she sent me a generalized reject email(template). and she refused to give proper feedback. Like wtf?? Do you think i am a cheap labor? To respect the candidate atleaast you could give a proper feedback after spending two days on that exercise?

Worst experience ever. It was really good in the beginning. Applied online, got contact from Recruiting Coordinator. Then arranged a tele interview, then next day i got a coding test. I was given 5 days to finish the test. (You can imagine how many work to do). In the test, they specific said there is no restriction of framework. So i used Require+ Backbone and completed all requirements. I sent it back after 3 days. Then, after 3 days waiting, they send me a mail said they want to hire someone who got more Angular experience. If you want candidate use Angular why you can't just say it? Is that a trap? Totally waste of my time. I used Backbone doesn't mean I don't know how to use Angular. A professional company would never do something like that. Good luck Bigcommerce. I will join Shopify and kick you out of the market!