I have faced the same problem 20 days back and when i reported my concern to the helpdesk last week the executive said it was done by your permission and where as i remember i have not done any such activation and if i do activate then why i will put such a dirty tone i will put a tone i like it.
when i called the reliance helpdesk 1st they confirmed that it is free for 1st month and will be charged if we do not activate it. in the call er ring tone subscriber wil not come to know untill some one point out to him and if not done by any one the subscriber will not come to know at all till he receiveds the bill. They activated without confirmation. it is a clear cheating and they are not ready to accept it.
I think we should raise a alarm in this regards and government should act soon to control. I agree with murali that govt should introduce number portability