Consumer Redressal

Hi my account no is 918095463 i got tata photon in my company plan and some terms that card is free and also i will use service for 6 months .but after 15 days of usage i was having spped of 4-10 kbps.i am getting the bill even i am already not using tata photon from last 3-4 months when customer care told me that in my area i will get 4 kbps speed even they promised for 3.1 mbps that time i told him to disconnect me now after 3-4 months what is the logic of bill when i paid for 2 months advance and used 1.5 months.now they are asking for 4600 .so overall they are asking me to pay 1800+4600 = 6400 for 1.5 moth with 4 kbps speed.this is bullshit and and now they are giving me justification that according to my plan i can not opt out before 6 moths even if they provide me worse service. . why they are following the policy of 6 moths plan when they can not follow their policy for 3.1 mbps speed. why did not they disconnect at that time when i told them. how can they charge people w