sir,my dad’s sim card became invalid last week.we imediately called to the customer care.they informed that we should check it with the nearest dealer .When we asked him he said to change the sim card.then my dad asked to the dealer who is in opp. to CMC hospital,he also said the samethen we bought the sim card worth Rs.75.they it would be activated the next day.we waited for 3 days and again asked the customer care,they said nothing can be done.my dad is using this sim for more than 8 years .then we asked the dealer ,they said we don’t know you go and ask in santhome ,chennai.as a govt.employee my dad he went to chennai by putting leave.In santhome they said that all the sim card information were sent for verification.your’s were not sen’t so your sim card became invalid,but it was there fault.Now totally a balance of Rs. 226 and Rs.75=301 is gone and we want to buy another sim card.