Teachers can only issue refunds on a per-lesson basis, and the refund must be requested within 7 days of the payment being made.
If you've purchased a package of classes, you'll be charged 24 hours before the first lesson. This means you can cancel the class anytime before the first lesson takes place at no charge. However, if you cancel after the first lesson, you'll only receive a 50% refund of the remaining class fees.
On the other hand, if the teacher cancels a class that you have purchased a package for, you'll receive a 100% refund of the remaining amount.
Just keep in mind that if you don't show up to a class without letting the teacher know, you won't be entitled to a refund. However, it's up to the teacher's discretion to manually issue a refund through the transaction page if they so choose.