I'm not sure why people complained about this company. In my experience the person who picked up the phone was courteous, explained that it would be 3-4 weeks before someone could come out. I was explained that I would be receiving digital and physical copies of my survey and I would get a call notifying me that the surveyor would be coming out. Maybe there was someone else on the phone previously that left a bad mark? I'm not sure.
All in all, I'm happy with the service and would use Avanti again for future projects.