Tata Docomo — Raising undue pending payment issue after 2 years

Address:

Ahmedabad, Gujarat

Tata Docomo: Worst and most pathetic service provider... First their network did not work( Photon)... hence i asked them to close down my service in 2011 Dec ( device number: [protected]).. They ask me to clear dues and inform them. I clear dues, inform them in writing... Then they confirm IN WRITING ( ref number :[protected], mail subject: Deactivate service~~M6115060) that no outstanding is there and connection will be close on[protected]... then one fine SUNDAY after two years in Dec'13 I receive a call from some LOK ADALAT, they suddenly wakeup and say that your 843 Rs . payment is pending!! Then i cald their call center ask them to trace their EMAIL communications... they say they will register complaint ( that too after demanding to talk with some senior).. today i receive a call from some arrogant and ignorant lady... very impolite... not ready to even listen the issue... raising voice occasionally ... continuously interupting when i talk... and says we can't track mail of 25th Dec'11 as it is too old... but she then reads out a mail sent by them to me on 24th Dec'11. WOW... After many frustrating attempts to inform her that HER company.. which I HATE since a long time... has given me IN WRITING that there is no due... she refuses to even check and says as per OUR records ur payment is due... n now ur complaint will be closed.!! Any help will be appreciated... Need advice on filing legal complaint