Vodafone India — text messaging

I use the ₹199 plan that gives me 100 sms everyday along with 1.4 gb data and unlimited calls. However, till date, i haven't been able to send text messages to any number from my phone. I tried switching phones but the problem persists. I checked my balance which showed ₹-3. Thinking this negative balance was the issue, i tried recharging but oddly enough, vodafone activates some unheard plans with the amount recharged, again leaving me with the negative balance. I've lost quite a bit of money trying to fix the negative balance. However, this cannot be a legitimate reason to deny me this facility as i had paid for this plan.