Vodafone Idea — Unable to send sms to 1900

Dear Sir,
iam not satisfy with your Internet Network
Coverage n Data Packs...Hence, i thought to move to Airtel...then i have started
to send SMS to 1900 for Porting...
but, iam not able to send only for 1900... "message Could not sent" is showing...tried 10 time...
by speking to Custmer care for solution...they keep giving non sense / irrilavent solutions: -
THIS IS MY MOBILE NUMBER [protected].
1.i did not recharged my mobile, as for as company rules so outgoing SMS barred...but monthly iam recharging
my mobile not less than 49₹
2. i suppose to change message centre no.- did the same but no result...
3. i have to change the handset - tried but no result...

moreover the Custmoer care representatives not available for 3 days, n they are are not giving a chance to spk ...
Plz help me...
THANKS AND REGARDS
DEEPAK YADAV