Grabjobs.in — verification fees

I have paid rs. 2500/- as registration fees after that they have demanded to pay rs. 7078 as verification fees which i have. They gave confrimation after two days that they have received rs. 7078/- with gst, but gst no. Is not mentioned on receipt. After that one telephonic interview done with bombay cambridge school office. I had given very bad interview, still i got selected for job rs. 50000/-, but they are demanding rs. 15000/- to pay. I cannot pay further rs. 15000/- so i want my verification money back. But now they are not replying. Concern person name is shewta [protected] and rahul [protected].