Refund of service tax if service not provided by y-axis

I have approached Y -axis Bangalore for the Canadian university admission with IELTS score 6.00 score/band and checked with them if they can get admission with that score and they confirmed they can get an admission in the university and asked me to pay the amount to start the process, for which i paid the below amount.

Advance towards services to be provided
(Price Include Facilitation Charges)
INR 18,360.00
Add: Service Tax (14.0%) INR 2,570.00
Add: Swatch bharat Tax (%) INR 92.00
Add: Kalyan Krishi Cess (0.5%) INR 92.00
Total Amount INR 21,114.00

Later other consultant calls and tells me that i cannot get admission because I don't have 6.5 score.
i was deceived with wrong information and I requested them to give me money back as they truly misguided me with the wrong information.

Now they wanna pay me only INR 18,360.00 and they would not want to give me Service Tax amount. I feel they have not provided me any Service and they don't have any right to deduct that amount.

Kindly advise how i can get back my total amount including service Tax. Otherwise what would be the right approach to deal this situation 

Awaiting for your valuable information.