Davis Elen Advertising interview questions

The HR person was very friendly and open about how the interview process was going to look like. The reason why I had a negative experience was that part of the interview process was creating a marketing strategy for one of their existing clients along with multiple mockup posts and analyzing their audience with a week long timeframe to complete. I prefer to not do unpaid work, especially if it is work for an existing client. I understand if it is for a fake client, but in this case I will not be doing unpaid work for an actual client for an entire week.