Airtel — recharge of rs 399

I did a recharge of rs. 399.00 to avail the benefit of free local+std calls + 1 gb data for 70 days. It was done after getting promotional messages received from airtel. But, today, after expiry of only 28 days, my outgoing calls are being charged which should have been free for 70 days. Requesting airtel to extend the free calls + 1gb data for balance 42 days.