No! — Instagram cannot block, ban or do anything to harm your account for buying followers. In 6 years time, this has never happened before.
Imagine that if Instagram would ban people for buying followers, about 70% of Instagram would be banned by now. As over a billion followers are purchased each year. Besides that, if Instagram would ban people for buying followers, anyone could just buy a couple of thousand followers for their competitor to get them banned.
So no worries — you're safe. And besides that, the followers we deliver are real people instead of computer generated bot accounts that other services send to their customers.