Buy Followers on Twitter Cheap Review

Once you sign up for services, you are not allowed to make changes to your accounts or you’ll lose out on the warranties and guarantees. This includes changing your profile picture or username, as this can render them inaccessible to their system.
Any offline payments are not eligible for warranties and refunds.
Other than that, the terms are pretty standard.
See the Terms of Service yourself here.

365-Day Retention Guarantee on all their Twitter services
If you notice a decline in your follower count after purchasing, the company will replace those followers free of charge.
The extra followers that come with each package, however, are not covered by the retention guarantee. They only serve as a buffer and should be treated as such.

30-Day Money Back Guarantee: If you find yourself dissatisfied with their service for any reason within 30 days, you are eligible for a full refund.
100% Money Back Guarantee: If the service is not delivered as promised, you can get a full refund.

Complete Review