BSNL Cellone — Do Not Disturb Activated but not working properly

Address:	Chhindwara, Madhya Pradesh
Website:	bsnl.co.in

I have activated Do not Disturb service on my BSNL mobile number, but still receiving promotional messages. The service i asked to start was DND Full, but still receiving promotional messages and calls. I have already made a complaint about it but still the issue is not resolved. There are some promotional messages from BSNL also. Can some one help by resolving this issue. Thanks in advance.