Byjus - Byju's — learning app is not useful to answer the school book

We have ordered the Byjus Tablet learning program (order no *********) and I received the courier on **-**-**** but my ward is not able to understand the method of teaching of the video. I wish to cancel the order and surrender the TAB, kindly do the needful asap and refund the amount paid to them.
There are a few reasons for this decision:
*. Videos are not useful. Even after watching the video and answer the questions of Byjus app, my ward is not able to solve the questions of the school book on the answer sheet.
*. At the time of meeting with Byjus representative he told us if the child will not give the correct answer of the question then a link will automatically appear on the screen for the new video and after watching the new video a new set of question will be asked by the system, but the learning team at Byjus told me that the new video will be provided on the request of the member /parent.
*. The counsellor of Byjus told that the parent can track the child's progress at any time, parents can track how many questions solved by the child, how many correct and how many are wrong. But the learning team told that the data is available with Byjus at there control centre and the same will be provided to parents after the closing of a month, means next month of the activity.
*. Byjus people are just forcing to use the product irrespective of that the product is useful for the buyer or not. Byju's cancellation/refund policy said that the buyer can return the product within ** days of trial period and the refund will be processed within the next ** days but after talking with Mr Rahul Bisht, he said that we will not process the cancellation as there is no defect in the product and suggest just keeping using the product.
I think the byjus team just want to pass the ** days of trial period so that they will not be liable for cancellation or refund.
There are a few more concerns because of all of that we are not comfortable with your suggestions given at the time of counselling. So my humble request, please cancel the order without any more cross-question. Suggest and refund the amount remitted to Byjus.