Bharat Sanchar Nigam [BSNL] — Message not sending to 1900

Address:

UP

I have tried several hrs. to get code by send PORT [protected], but couldn't sent . I have recharged with rs. 10 then 147 as customer care said. But still error 69 was displayed. Msg to other numbers are going well. So why it's problem with 1900.
Very harassment .
Please resolve
UP west circle. Bulandshahr