Dead Silence on landlines, calls and Emails

I am looking for in institution that give training in Boiler making etc. I STUMBLED upon Artisan Training Institute in Roodepoort. I have been calling them for details on what they offer, duration and costs of courses and even sent emails with my questions to *** ***. Sadly they fear talking to people or giving information because I have had no response from yesterday 14:44 up till now 12:31. When I dial their listed number *** the call gets set aside even so with the cells +27 (0) 83 655 832 / +27 (0)82 ***. On their cell I can clearly hear someone walking or being active on the other side but just listening to me in dead silence. IS THE INSTITUTE LEGIT OR IS IT A FLY BY NIGHT? PLEASE GIVE WARNING ANYONE