MTNL broadband (Triband) in Mumbai, Andheri W

Hi,I have MTNL broadband (Triband) in Mumbai, Andheri W. When the connection was launched, the speed was excellent and no service problems faced as such. Now, after around 6 months of usage, the speeds have fallen to around 12Kbps. As far as I am aware it would not even qualify to be called broadband. On lodging a complaint, the reply given is that my flat distance from the hub is a lot that is why the speeds are slow. (Although, from the time i have taken the connection, neither me nor the MTNL exchange has shifted).