Vodafone India — deliberately blocking sms to 1900

Recently wanted to port my no. To jio from vodafone, but on sending message to 1900, i am getting check opeartor service, have enough balance to send a message, customer care tells to do things you might already did, this is very unethical on vodafone part, also trai need to have alternate independent method to register for mnp. Hope they fine vodafone such deliberate immoral business tactics.