Corporation Bank — recruitment branch of bank

i have applied for the post of probationary officers published in newspaper in september 2009 by corporation bank.For the given post a exam was conducted by corporation bank in november 22 2009. I applied for the exam through their online registration, also paid the exam fees of Rs. 300 and posted the hard copy of form 10 days before the last date of 25 th september through the goregaon(east) postoffice to the address (post box no 9024, goregaon(east), mumbai:400063).but i didnt received the admit card for the said exam and when i contacted them they said that they haven't recieved the hard copy of form hence cannot be allowed to appear for exam.
i dont believe that the goregaon post office department took more than 10 days to post the form in goregaon itself.i think this recruitment program of bank is only a means of earning money as even though i was not allowed to appear for exam the money i have deposited is not returned back to me. they accept the forms only through ordinary post so it can be used as an excuse for rejecting candidates and eating away their money and filling their cash lockers.
also the fee of Rs. 300 has to be deposited to an account of corporation bank itself through any of its branches. i deposited the fee through the goregaon(west) branch of corporation bank and the branch charged an extra Rs. 30 as their commission.
I dont get if i am depositing the entire Rs 300 to corporation bank why i am required to pay commission to the branch of corporation bank