Tata Docomo — false bills

I have been a customer of tata photon for the last 2-3 years and have been suffering from its poor service from the very first date.i had repeatedly called the customer care telling them about my problems.even once a technician came to my home to check the problem and then later told that its all ok and i knew it very well how badly am suffering from its tortoise like speed. So i paid the current bill and told the customer care to disconnect my connection and i stopped using it.after two months again the bill came of around 1100 rs. I refused to pay the money since i haven’t used it and even asked them to disconnect it.and then came a phone call and letter of advocate arun goswami stating me to pay a negotiable bill of 750 rs and disclose the matter.i asked him why will i pay when i haven’t used it .he said me that it a misunderstanding of both tata and myself of not disconnecting the line properly and so i have to pay 750 rs and he promises that my line will be disconnected the moment i pay the money and no further bills will come (and he meant that its his guarantee).i paid the bill the very next day bt it all started now.again my bill amount had summed up to rs 881.what is this going on?is this the customer satisfaction meant to be? Neither service and now just sending intentionally wrong bills?? If this matter is not taken care of i will make it sure that all my friends using photon will come to know about this scandal and they will take their wise decision of not using tata services ever .my a/c id no. :[protected]