Medi Assist India — plans

I joined. An mnc few months back. They use medical assist for employee insurance. I opted for plan b since parents are not covered under default plan. I had to pay extra premium of 12k. Now this year i thought of changing the plan since i got to know that my sister's policy covers my parents. After inquiry i came to know that for plan b there is a locking period. This was not mentioned properly on the front page while applying. Rather it was mentioned somewhere in the agreement down the line which i had not read.
This is a fraudulent practice of deceving the customer and putting compulsion. I am really unhappy by the way all this went. I am still trying to find a way i can get out of this entire insurance plan.