Bigbasket.com — My order NJMKLO[protected] was termed as completed even though none of them has been delivered.

On 13th June I placed an order of Rs1759 to Jugipara lane, Chinsurah. Order id-NJMKLO[protected]. The delivery date was showing was 16th June. On 16th June the delivery was postponed to 17th june and no luck on that day as well. On 18th June got a call from big basket executive that due to some technical issues they wont be able to process the order so I must go ahead and cancel the order which I did on that day itself. I was assured to get the refund as well. When today I havent got my refund and opened the app to check it showed that my last order has been completed and delivered. When I called up the customer care they said that my order has been delivered and when I told them about the whole scenario they said that they are checking with the delivery executive but yet to get the response.
I wish to get the money back as soon as possible.