Kolors Healthcare India Private Limited - Deducting Money from Debit Card EMI without any service start

Name of the Agency -Kolors Health Care Pvt Limited
Type of Service -Slimming Course
Invoice number-GHB/******/****,
Dated **-**-****
Total amount -**,***.**
EMI Amount *,***.**
On dated **-**-****

I had visited the agency Kolors Health Care Pvt Limited for the slimming course .When I visited that agency, they informed me regarding the course fee for the slimming course.
I told them it's not possible to avail the course, as I have some financial issues as well as I need to discuss with my family and my doctor before start that. So I informed them that I will visit next day if I will be interested for this course. But they started forcing me and informed me that the have some offer for that day only. I told them that I dont have money and may be I will not take this course because I have some issues.
But they are telling that I can cancel this enrollment if I want.
I asked them that if I didn't liked the services whether I can cancel the booking or not , they responded that I can cancel .
AsI told them due to financial issue I will be unable to pay the amount ,so I will visit the next days for the booking confirmation if I need the service.
but they forced me to enroll by that day because they had some offer and told me that I can pay via EMI .
They had also told me that I can cancel my EMI within few days before the service start If I don't want this service.
At the same time they asked me for my debit card and told that they have processed for the EMI ,as the EMI amount is -*,***.** and told me that I can cancel the booking within few days if I want.
The next day, I visited the office ,I told them to cancel the booking.
Firstly they had arguing with me after that they told me to give a letter, they will send to the respective higher authority to cancel EMI.
I had given them a letter for cancellation ,they said that within ** days they will cancel the booking as they will cancel the EMI.
They had taken all membership card whatever they had given to me on the first day.
but till now they haven't canceled and they have deducted * months EMI ,Dec **** ,Jan **** and Feb **** ,and now they said that they will not refund my amount .
As per consumer I haven't taken a single service from the agency ,but they are deducting the EMI amount ,I have even contacted to the ICICI bank ,they said me that till they will not get the confirmation from the merchant ,how they can stop EMI ,as per consumer I wants to look into this matter ,refund my amount and cancel the booking as soon as possible as its been more than * months .