Bright Career — refund of amount rs.8000/-

This company Bright Career, told me that they have a tie up with shine.com and provided me the job of airlines & asked me to pay Rs.2000/- first, then Rs.6000/- later(both refundable as they had mentioned) & when I got selected in the further round they asked me to pay more amount of Rs.3000/-(non-refundable) & Rs.10, 000/- for medical checkup(refundable), which they never mentioned before. Now, I have found that they are doing a fraud with me, so I told them I can't pay any further amount before I get a written statement from their side & asked them for the refund, but they are telling me that, refund is not possible now. It'll be given in 30-40 days. How can I rely on them?
They were never clear about these kind of further charges.
I have attached the document where they have clearly mentioned that the amount is refundable.