[Resolved]  Akbar Travels — booked wrong flight

I have booked a morning flight on srilankan airways ul 165 from cmb to cok, through akbar travels, cross checking the itinary found that i was issued with the evening flight.
Raised the complained and they have send me option to change with penalty.
Why am i charged with penalty when the mistake is from the travels. I was happy that they have discounted the service charge on credit card (Rs300) but this was a day light robbery