is that safe? most such services usually get bot followers instead of real followers, I prefer to follow manually hoping someone will follow me back, because that can get real followers, By the way, why do you get negative trust, is that your disappointed customer. 
Yes, It's completely safe. Maximum followers are real. This is the quietest way to get followers that customer needs. That is why this is a paid service. Reason of negative trust: https://bitcointalk.org/index.php?topic=5218834.msg53649115#msg53649115
You can also join the party and give some negative trust. I don't care. LOL