[Resolved]  Idea Cellular — wrong prepaid recharge done

Hi
I wanted to do a recharge on of 347 which is for talktime but by mistake i made recharge of 349 from paytm which is of data. When i noticed this suddenly i called customer care to fix this that guy told me that once recharge is done we can't do anything but the recharge of data pack is not at all usefull coz the number is used by my grandfather and he is using simple phone in which he don't have browser so i requested them to switch the recharge he was just ignoring me. So i want to know how can do this
Thanks in advance