Shocking service

Mango flight JE 821 on 9 September 2017 was delayed twice. First from 11.50 to 13.00 and then again to 15.40. By 16.00 we still hadn't departed. Communication was pathetic. Vouchers were handed out to the few people lucky enough to happen upon the staff handing it out. There were 3 gate changes, again no communication. The boarding passes were then re-issued, whereby seat numbers were changed without notice or bothering to inform anyone. This is the worst service I have ever had on a domestic flight