Reliance Digital — Boat nirvana ion tws delivery issue

Address:

Noida sector 58

I ordered boat nirvana ion tws on 18th April and it was showing that the delivery will be done by 19th April but there was no update regarding delivery of my order.
Its 21 April today and still there is no update regarding the delivery.
I contacted the customer service and sent e-mails also but they didn't resolve my issue.
I asked them to cancel my order but they denied.
I want to cancel my order and take my money back and please never trust on reliance digital.