[Resolved]  Vodafone — Calls not connecting

I use to call my native place number(BSNL landline in TN) from my vodafone mobile(Hyderabad number) everyday, of late the service has become poor that I get an insane message "The number you have dialled is invalid, please check the number you have dialled", this is pissing me off badly, because this is the number which I am dialling daily and of a sudden it becomes invalid. It does not even reach the network, as I get this message without "any" delay as soon as I press Dial. The irritating part is I face this problem during the evenings, mostly peak hours(my guess), other times it is connecting to the number. I had filed 3 complaints with the customer service, all in vain. They say that they made a test call and it works, they are not ready to understand the problem. They simply log a complaint and reply that it will be taken care of within 10 days(frustrating wait period), and they close the complaint after making a test call, they do not understand that this happens during peak hours. Now after 3 complaints the problem still exists and there is no technical support guy I can talk to. I am not able to connect to some other BSNL mobile numbers and Airtel landline numbers, is there a escalation point, TRAi or something where I can escalate this matter to.