signed up with Tata broadband on the 12th of May

Hi all
I just got a new computer and signed up with Tata broadband on the 12th of May. The sales guy told me that the connection will be provided by 5 days. And guess what?…Its the 22nd of May and i still havent got the connection. So i call up thier customer service and the executive tells me you havent paid for the service till now. When i provide the reciept number to the executive he tells me that he apologizes for 5 times and he will take care of it….lol…give me a break…wat should i do?….sue them????…jezz i dont know:(