Medi Assist India — cancellation of medical policy

Address:

Hyderabad, Telangana, 500090

I am Tech Mahindra Employee. I accidentally/ mistakenly selected parental issurance while submitting and which I tried cancelling immediately, but it didn't the cancel request.
I do not want to add my parents for this insurance because which I already have made from outside and now it is waste of money here. For one month the insurance company is deducting nearly up to 4000 RS of amount from my salary account.
I do have my personal commitments like education loan and vehicle loan which I need to pay, there is short of money to pay those loans now and I cannot explain these things to bank now, where they do not listen to all this stuffs.
I spoke to 'N' number of people in mediassist and everyone answers the same that they cannot cancel the policy once it is opted.
This is ridiculous and stupid rules which is made by insurance company, it is individual decision and our money which we are paying it to you and we do not have any rights to cancel the policy.
I do not need any explanations on this anymore and I just my want money back.