Consumer Redressal

I have Reliance 3G Sim No. 8443868050 since last 10 months but from the month of October 2014 Proper net work was not available in this connection and I lodged the complain severally through Mail and over Phone, after getting the complain they have asuured me that the network problem will be solved and I have to pay only the usage data amount as a result they have reimburse Rs. 181.76 and informed me over phone. But the Bill for the period of 09-12-2014 to 08-01-2015 has come Rs.894.00 which is totally erroneous because I could not access internet properly so how the bill is reached to the amount. I am very upset due to the poor net work of the connection due because I am unable to do the work related to Internet, which has wasted my time. I have requested them to discontinue the connection and I want to Not to make payment to them as they have given only assurance not services.