Blue Dart Express — Inappropriate charges & poor staff

Address:

New Delhi, Delhi, 110017

I called bluedart customer care today to confirm about the charges & estimated delivery time for delivery from 110017(Delhi) to 400050(Mumbai). According to them charges were, base fare for 500gm is Rs310 + Rs155 for per extra 100 gm and delivery time was one business day.
Then I had a talk with a customer care executive and she told me that if the delivery is made before 6:30pm then it would most probably reach the destination by tomorrow evening .
After confirming all the details I went to the bluedart office just below my appartment.
Going there was a terrible experience for me. The man in the office took my bag which was supposed to be delivered and without even weighing it said it would cost around 490, before I could say anything, he said this is the starting price, then he weighed it and said it's 1 kg, it will cost 690 something. I could clearly see it was of 600 gms, I continuously said it's of 600 gms but he was avoiding me like anything, then he said if it's above 500 gms then it means it's 1 kg. I then narrated him the entire talk I had with the customer care executive. To which he replied agar wo wala karana h to fir Iski koi garranty nai hogi. I was shocked to hear that. Why are we opting for blue dart then. Then I told him that it's not the first time I'm using blue dart, I have always used this service and never got any complaints. To which he said we will then not pack ur item the way we are packing this sir's item(another customer) I said I want to make a normal delivery, a simple one. To which he said fir to apko khud hi pack karna hoga, hum nai karenge. I asked them to return my back and the politely returned it and I came back and called the customer care again, told them the exact weight that is 600gms and she said it's not possible for them to charge me more that somewhat around 490. And she even asked me to make her talk to them.
But I didn't prefer to go back there. Because there behavior was very unprofessional. I want the managers to go through the recordings if they have cameras in there outlets, to check how their staff behave with the customers.