This is 100% guaranteed or your money back!
Once payment is sent, you will start to see growth within 72 hours and it will last up to 2 weeks.
These followers are all real and active. They are mainly from tier 1 countries however it is impossible to do organic marketing and not see foreign accounts come over as well.
You will experience a small 2-5% drop off rate once promotion is done depending on the quality of your account.
There's nothing for you to do other than engage with your new followers and stay active on your account :)