Bachelor of Legislative Law or LLB is an undergraduate degree which is offered in most common law countries like India and England as the primary law degree

As you have said that you have done BA so its worth to go for LLB as for doing LLB the minimum eligibility required is 12th and you are over qualified for this Course and if you do LLB than the past three years of your BA is of no meaning

So as per suggestion you should go for MBA in Law Business as you have interest in Law then it matches with your interest and also your studies will not get waste

Here I am providing you list of the colleges in India offering MBA in Law Business
Mahatma Jyoti Rao Phoole University
Address: P-2 & 3, Kant Kalwar RIICO Industrial Area, NH-8, Near Achrol
Jaipur, Rajasthan
Phone: (01426) 283952, 283953
Courses Offered
M.B.A. (Business Law)
B.B.A. + M.B.A.
B.B.A.

Praxis Business School
Address: Bakrahat Road, Po.Rasapunja, 24 Parganas (South)
Kolkata, West Bengal
Phone: (033) 24980553, 2498054
9836877599
Courses Offered
M.B.A. (Business Law)
M.B.A. (Business Information System)