Byjus - Taken money for a cancelled product

One of the salespeople from Byjus app had informed us over the phone that he will come and give a demo on the product at home. After doing continuous calls I agreed for the demo. He came home and played the demonstration and he had informed us that they are giving a trial version to test whether this product is useful or not. I inform him at the same moment that I have to check with my husband for further. He told this is an offer and will not be valid by tomorrow. He had taken a cheque from me to give the trial demo and not given any proper information on the same. The product reached at home on Feb **th afternoon and my son has viewed the product for *-* days and due to Xth board exam schedule, he did not get the time to review the product and give feedback. He was having an exam on Mar *nd. After that, he had reviewed the product and informed me on March **th the product is not looking feasible for him and need to be back. At the time of the demo, the seller informed me that if the product is not feasible you can return the product and the amount which I have paid id *****/- will be returnable. He did not inform me of the time period in which I have to return. Even if I have contacted him on **th to get the information to send a cancellation mail to concern and he had replied me with the cancellation teams details on March **th which was the **th day of getting the product in hand.

We have received a response from the team that you have contact on the **th day and it is not refundable and asked to continue the product. I informed the person, Mr Abrar, I dont require this product whatever I loss I will bear ie *****/-. I thought of the loss is loss of *****/- because I have cheated with false commitment. I could not able to contact them due to a few personal issues in between and my son's board exams.

During the time of the demo, he has taken a cheque from me if the product is feasible for continuing the product I have to pay the amount. For that, he has taken from me a cheque for EMI process. As I have already informed the team I dont want to continue the product they have to discontinue the product with the advance payment what I have paid initially. Ít is also not my mistake as well. They have not guided me properly. I found this is a fraud practise they usually do.
Yesterday I found that they have processed EMI and taken **** Rs from my account without my knowledge. Even they have not intimated me that they are going to continue the product and processing my loan.
This is illegal and I dont want to continue this and I need my money back. This is the case of cheating and they are doing this with a false commitment to sell the product. Request you to please do the needful.