I hv booked cab to drop me at domastic airport cab...

I hv booked cab to drop me at domastic airport cab reach on time at pickup point Taj Vivanta. No charges has been disclosed on booking or on confirmation message. I hv asked driver where is meter he has shown car kilometers meter and set zero. When i reach airport i asked how much he called on one no and askme for Rs.450/= as Air port drop charges. when i asked him why? he said it is standard for our co. when i threten him he has taken Rs.350/=.
it is wrong i am putting my experience on web to keep pepole caution to use Mango Cab in Trivandrum. Kuldeep Gupta Jaipur