TATA SKY COMPLAIN(PUNE LOCATION)

Location/place: ratnagiri

Name of company/service: TATA SKY

I bought a TATA SKY, The sales person told me installationwill be free with additional charges if the wires exceeds more than 12mtrs, Later on After purchasing when the installation completed the doest inform me any thing, they charges me Rs. 411/- from my TATA SKY A/C. On asking back to the customer care dept., they said this is charge of installation those charges i need to pay and accepted that they had forgot to tell this to me while enquiry.
Therefore for their mistake why should i suffer