Calls everyday and never leave a message. I guess to avoid someone listing who the number of this is when you call back they never say the company name like normal people that answer a business phone. So I would say save your time and just block if you can. Because 1. If they was legit they would leave a message like normal people and 2. They would say who their company is if you call back. Only people that hide is scammers, telemarketers and some time collection agencies.