Tata Sky — Unjustified charges by tata sky

Address:	Firozabad, Uttar Pradesh, 283204
Website:	www.mytatasky.com

Sir, i have purchase tata sky(ID [protected]) on 23.09.15&company had given assurance of One year warrantee of set of box & one year free service.On 12.09.16 some trouble showing on my TV screen&complain to Tatasky help line centre.On 13.09.16 Tatasky techician came&changed the set of box&same problem again occured&then technician adjusted the antena&problem resolved but he did not checked that old Set of box is defective or not, the problem was occured due to distubance of Antena.On 14.09.16 a message got that your tata sky deactivated due to low balance(but 200rupees was balance before a day) &you charges 600rupees(400rupees of set of box&200rupees service charges)&my account has gone minus 405rupees.
sir, i have complained many times to tata sky but they did back by account balance.When my connection is under warrantee period & under free service then which type of charge, please help me sir