Old Bharti telecom Limited shares

Does anybody how I can demat or exchange old Bharti telcom shares. They had offered a buy back in 2007 for 96/-. But I could not do it at that time. Now when i contact them they are not responding. Does anybody what can be done?
There is a company named 3a Capital Services Ltd. They advertise in The economic Times regularly that they buy delisted shares of companies like Bharti etc. You may contact them and ask what they are willing to pay. Following is the URL of the page where you can fill details and send them a query:


Please note that I have never used their services. I have just seen their small ads on the share price page of the ET. So proceed at your own risk.

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