Bill issue

Dear Sir,
I found some majour discrepancies in my bill (Matrix no:559281820, UAE, Account No:703208). It was communicated to me by Matrix company that there is a special plan of Rs 500 for voice card Dubai group in which following was included.
• Full talk time of Rs 500.
• Incoming call free from anywhere.
• Matrix to matrix in Dubai free.
• Other networks local in Dubai Rs 6.
• International call to India Rs 27 per minute
• And also provide forex or travel insurance.
I was wrongly charged vide two bills Rs 763.82 (Bill date: 29-Apr-13, Bill no: DUBAI497465, Bill period: 27-Mar-13 to 26-Apr-13) + Rs. 3464.26 (Bill date 31-May-13 , Bill no: DUBAI498179 27 Bill period: Apr-13 to 26-May-13) total : Rs. 4228.08.

Please note that in first bill I was charged some fix charges of Rs. 334.88, which is a complete surprise to me as there was no fix charges in the plan that I had opted.
Moreover I have been charged for calling on CUG number in my second bill.
Not only that I have also been charged more than Rs 27 per minute on international call to india and more than Rs. 6 per minute in local Dubai calls.
My total international call to India as per your bill comes to 64 calls [Duration 00:50:50(hh:mm:ss)] which if we calculate at the rate of Rs 27 per minute comes to Rs. 1728 and local calls 55 in dubai [duration 00:45:30 (hh:mm:ss)] at the rate of Rs. 6 per minute comes to Rs. 330. In total my total usage will be 2058 out of which if we deduct free talk time of Rs. 500 (2058-500) it comes to 1558.
I have reported these discrepancies to company executive Mr. Sanjay and after talking to his head office he had agreed that there is a mistake in my bill and that I will be issued corrected bill within two working days. It has been 4 months and I have not received the corrected bill. Moreover company has wrongly charged Rs. 4228.08 (763.82+3464.26) from my account. In this regard please also note that a refund cheque of HDFC bank of Rs.1278.46 (no: 054575, dated 24/06/2013) has been issued infavour of me. But the corrected bill still has not been sent and that they have charged me not as per the tarrief promised to me though their company representative Mr. Sanjay through SMS.
BEING CONSUMER IT IS MY RIGHT TO HAVE BILL ON WHICH BASIS I HAVE BEEN CHARGED. I HAVE WRITTEN ATLEST 5 EMAILS TO COMPANY TO PROVIDE ME THE BILL BUT TILL DATE THEY HAVE NOT SENT ANY BILL TO ME MOREOVER THEY HAVE EMAILED ME THAT IT IS IMPOSSIBLE FOR THEM TO GENERATE BILL AFTER ISSUEING ME THE CREDIT NOT.