You can only receive a refund from the merchant as they have charged you this cost. If you did not cancel your subscription in time, then it depends entirely on the conditions of the retailer whether you are entitled to a refund. If you did cancel your subscription on time, then they are obliged to refund it. The next step is to contact the merchant to find a solution with them. If you cancelled your subscription on time and the merchant does not want to cooperate, send the proof of cancellation to support@paybonsai.com.
If you are not entitled to a refund but are dissatisfied with their service, unfortunately we cannot help you recover the amount. You will have to come to an agreement with the merchant or you can try to make the most of your renewal.