Acacia Communications interview questions

Virtual first interview on a Tuesday. Was told applicants would find out that Friday if they were moving to second stage interview. No update received Friday. Left it off until the following week as it was a bank holiday and that may have caused delays, but still no update and no response to emails. Such a poor experience that a company that goes to the bother of interviewing someone, can’t send a simple email to let the applicant know if they are moving to the next stage or not. Literally takes a few seconds to send an email confirming the outcome.