Payzapp — did not get refund after almost a month

My money is not refunded by payzapp of amount 3670/- i had used payzapp to make a payment on big basket by my debit card but my order was cancelled on same day that is 29th aug. Now it has been almost a month, i have not received my money from payzapp gateway as big basket as already refunded my amount on 31st aug 9:51 am and shared the transaction id too and same money is stucked with payzapp which should be credited to to my debit card. Please refund my money and if there is any technical issue on your side please sort this out and refund my money.