Airtel Broadband - Not Receive My Refund From Last 6 Months

Dear Sir/Madam,

Account Holder Name Veerpal Kaur
Account no.: **********
Airtel Fixedline no.: **********
Xstream Fiber ID: ************_dsl

I have discontinue this connection in November, after *-* days installing new connection. I had paid advance * month rental for this. At that time i had called customer care that i will receive my refund in ** days. But till date i have no receive any refund amount.
This is brief detail

**-**-**** (from me)
I complaint about that not get any cheque or balance back to account.

**-**-**** (from airtel)
You agree that amount is not transfered to me and ask bank detail for rtgs.

**-**-**** (from me)
I send bank details to airtel.

**-**-**** (from airtel)
Airtel registered rtgs (*********) and ask to wait for ** days.

**-**-**** (from me)
I mail you that i have not recived amount yet.

**-**-**** (from airtel)
again aitel mail me that i they have refund **-**-****.

**-**-**** (from me)
Again i mail them same that i have not recive cheque. Same Questions

**-**-**** (from Airtel)
Airtel mail me that cheque is issue on **-**-****. They ask me to send again bank statements. (why you ask that question again)

**-**-**** (from me)
I again send them bank statement.s

**-**-**** (from airtel)
Airtel again mail me that cheque is issue on **-**-****. and ask me to send statements.

**-**-**** (from me)
I again send them bank statement.

**-**-**** (from Airtel)
They again ask that refund is done. and ask me to send statement again.

**-**-**** (from me)
Again i send statements to them/

**-**-**** (from Airtel)
Again they ask me to send statement.

**-**-**** (from me)
Agains send them statement.

**-**-**** (From Airtel)
Airtel mail me that rtgs is registered and refund will be in ** days.

**-**-**** (from me)
I mail them that i have not recieved refund till today.

**-**-**** (from Airtel)
Again mail me that refund is done on **-**-****.

**-**-**** (From Airtel)
Again Airtel initiate ref no ********* for refund in ** days.

**-**-**** ( fFrom me)
I have not recieved ammount and it's ** days ago.
I mail Airtel not recieve my money back. And I also attach my account statement till date.

**-**-**** (from airtel)
Airtel write to me that refund was initiated on **-**-**** and will be tx in* days. Why they write such mail . Because ** days are already gone and statement is sent.

**-**-**** from me
Again send the account statement. And I ask reason for rtgs not successful third time.

**-**-****
Airtel not give me reason of rtgs fail. And tell that it was initiated on **-**-**** and will take * days. Again ask me to write again if not done in * days.
I already write to them after ** days. Why they ask me same question again and again

Also Telephonic Customer Support also told me that they can do nothing for me. Only mail can help. But over mail they are repeating questioning again and again.