Amazon India — Don't received any refund in my bank.

Address:

Gaya, Bihar

Sir I am Suraj kumar. Order date 28-May-15 and order no is .[protected], email id [protected]@gmail. Com and contact no [protected].sir i bought yu yuphoriya at rs 6999 and successfully return it to amazon due to many issue such as proximity and heating while charging.they issue the refund on 9-july-2015.but till date today I have not received the refund in my account and even not a 91rs check which they said to send on 4 July2015 the courier charge.they say to contact the bank but the bank told me due to some error or name mismacht as the bank account belong to my mother and the refund was send on my name Suraj kumar.and also I bought it with debit card but they told me it has been order by net banking and the refund has been send through net banking medium but in my bank account I have not started any net banking service so, how could the money reach to me or the refund they claim has not been issued successfully.they gave me reference no and transaction id but the bank told me I can't tract any thing with this transaction and reference no.I have even send the proof the bank statement that I have not received the money till date today on 21july 2015 at 1:50pm in clearly they can see that their is no and 6999rs debited in my account. Sir I am completely frustrated and fedup.I have talk to their senior manager even more than 5times superviser and general assitend more than 40times.they are just stubborn and don't respond to my query.please help me.