Bharat Sanchar Nigam [BSNL] — dnd not working still receiving dirty sms to join dating phone chats and objectionable sms

Dear sir/madam
I have taken mnp from idea to bsnl for my mobile numbers used by my family members including mother, wife, girl child etc
I requested for dnd for all numbers but its so sad to note bsnl being government company does not respect the trai regulation to stop unsolicited dirty sms sent by rogues and dirty minded people
Iam fed up with the negligency by bsnl
I tried to stop sms using dnd stop messages of all kinds but still i get these messages, i tried to use third party blocking apps but they too are infiltrated
Why bsnl is so pathetic towards its customers
I request your kindself to look into the matter and help me and all other bsnl prepaid postpaid moblie phone users from dirty cheap and unwanted sms, phone calls
Thank you
Best regards
Vijay kumar