Hair refuses to grow longer than 1mm to 5mm in length. Been like it for many months

It generally takes 6 to 12 months to see results after surgery.  If your surgeon (who knows you best, who examined you, who did your surgery) has no idea anything here is just guess work that may lead to more confusion and frustration.  You can consider seeing another doctor in person for an exam if you want a second opinion.

You may want to begin using minoxidil to see if that helps with hair growth and the length.  Some times minoxidil helps with the texture, thickness and thinned out hair.  

If you are talking about a period since march of this year, that could be the stubble of the hairs that were transplanted. IF you are talking about March of 2014, then that would reflect a failure of the transplant. There are many causes of a hair transplant failure to include: technical failures at the transplant team level or some autoimmune disease of the scalp. Short hairs like you are describing that extend beyond 12 months do not reflect growing hair. You need to get a second opinion.