Vodafone India — change of plan

I need to change plans for my fathers phone number [protected]
He is suffering from neurological problem and not being able to change his plan. His current plan is talkmore299_b it is required to be changed to some plan which will be within rs100/- and it will be only for talk time and message.
Please provide details to my number [protected].
I am really disgusted with the way vodafone has served, many a times there representatives after giving mail have not responded.
The stores are so crowded that i have to wait for 1 hour to 2 hour for resolving the simple issue.