VRL Logistics / VRL Group — money problem

Address:

KR towers,gali number-3,near pooja medicals,chhalera village, Gautam Buddh Nagar, Uttar Pradesh, 201303

I send 2 parcels from vrl logistics, a-74, block a, sector 5, noida, uttar pradesh 201301 and that costs 750 rupees. He asked me to pay amount at there office and he gave me slip.in that slip he have to mention "paid" but he mistaken and typed "topay" so because of that i have to pay at delivered office also. So basically i paid two times and now after knowing about that and i called to the office and explained this thing and he is telling that dont know anything. But he charged me unnecessarily