As you mentioned, the name of the company was earlier Goldstone Infratech. A quick background check brings up the following result.
Also MEIL is one of the shareholders of the company. A google search on MEIL or its directors (Megha Krishna Reddy or Pitchi Reddy) will lead you down a very very interesting rabbit hole. Do check it out if you have time 
Any investment thesis for the company will need to be made in the backdrop of the above. Personally, I would stay away from such companies even if they show good numbers (very likely as the business is dependent on tenders floated by local authorities and “connections” could help them win contracts).