How to apply for Interview online? My documents weren't collected at CVAC even after paying fees.

I'm worried because I'm applying for Student X1. I was at my consulate district 2 days ago. At CVAC, my documents were checked but I was told bring my sponsor's Personal bank details, CAC & Memorandum (originals). After this, I paid the fees and told to book an interview online.
My worry now is that my documents weren't collected and I wasn't informed of how to book the interview. HELP!!!