I have tried a service called
Promosound. These guys can get you 1000 (in 7-10 days), 2000 (in 20-25 days), 5000 (in 30-40 days) or 10000 (in 80-90 days) followers on Soundcloud. I was quite skeptic in the beginning and there were some things that didn't seem right to me, but I decided to try it out anyway.
I have been asked not to disclose any details about how they are working or how they might be working. IMO fair enough.
But I am very satisfied with their service and
I recommend it. Not only that, I am planning to probably use their service in the future again.