Lenskart — Wrong eye test

I went to my nearby lenskart store and get my eye test done and ordered a specs as per that but I find it difficult to see properly with it.So I went to my local optician and he tested my eyes and found a huge difference in both the power i e., the actual one and the one tested by the lenskart staff on the store. I want compensation for the negligence of the staff during the eye test because I have to face several difficulties due to their negligence and incapacity to do a proper eye test.