help regarding paypal refund

I done transaction through paypal on myntra as on 14 feb. But transaction is cancelled automatically and my payment is deducted from Bank.  But paypal confirms that we received your payment and we will refund your amount to your bank account within 30 days.  But after again calling to paypal after 1month they demand 1 more week and then they send me email in which they mention that they aready credited amount to your bank account on 14 feb and they also provide 23 digit reference number and they said in email that you confirm with your bank with that reference no.  But according to bank no any payment is received, and they can’t able to help with reference number.
So please help me how can I get my money.