Airtel — unprofessional attitude of customer care and exorbitant billing every month over plan

I am having two airtel numbers [protected] and corporate no. [protected] on behalf of sbi. Undue bill is raised over and above plan amount every month on mobile no. [protected] for which no satisfactory clarification is ever given by your customer care deptt. Which are bei g charged on account of value added services every month which i never applied. Even your senior staff is never availavle on pretext of being busy. Pl let me know the next forum where i can raise my voice else i have to go in for portability for both of my numbers to some other operator if not solved immediately