HP India — refund not received after cancellation

Website:

www.hpshopping.in

I have cancelled an order from hpestore for the laptop on july13.
Order id#922850.
Received the first mail on july 27 for the confirmation on the cancellation after so many mails and escalation.

As per their statement:
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The cancellation request will be processed within 24 hours and the refund will be initiated accordingly and would reflect in your card or account used, within

Debit card
Within 7 -15 business days
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After the second escalation, they have asked to share my account details.
I have shared my details on 11th sept. Till now there is no response from them. I didn't receive my refund.