Consumer Redressal

I had ordered Oximeter from Dr Trust brand on 3rd May 2021, but I have not received this ordered product yet from Nureca Pvt Ltd India who has license to sell in Indian market. I have been requesting them to refund my ordered amount INR 2,999/- to my original account, but they are refusing my request stating that once ordered cannot be returned or refunded. As per their communication in the website before ordering , expected delivery date sis 2 to 3 days. Whenever, I sent them an email to refund my order, they have been refusing me to refund it. On 17th May, I had also requested to refund my amount within 24hrs but no response yet. They did send me an email and text message it will be delivered on 18th May, but on 18th May I got an another message saying that it will be further delayed till 25th May. This is useless service from Nureca who has not been paying attention to the necessity of this essential product during pandemic situation. They have been giving me excuses that due to covid 19 they are not able to ship it on time. I am sure both central and state govt's have not put any restrictions to ship anything related to medicals (including Oximeter). Oximeter is one of the most sold oximeter during this situation and if it is not available at the right time it is useless. I can get the similar Oximeter products from samebrand or other brands from Amazon and Flipkart within 2 or 3 days. Why Nureca Pvt Ltd is nether delivering my essential product on time nor refunding my amount. Kindly look into this matter urgently and get my amount my refunded as I had paid full payment via credit card and now I need to pay the credit charges without receiving my ordered product. Isn't this worst service by Nureca Pvt Ltd?