Emergency Staffing Solutions interview questions

Went into the office and met a manager, toured the office. It was a very brief and easy interview. The employees seemed to be friendly and like what they were doing from a first impression.

Went in with HR director. Talked for five min. Then sat with the COO for about two minutes and was asked to come in for a working interview. I scheduled the working interview. WORKED ONE FULL SHIFT with promise of pay. Was told I should expect an offer by end of week. Never heard from HR director again without me prompting the conversation through multiple follow ups