Poor service

I had problem with my gyser insurance was called arrangements were made.plumber was sent to fix the problem. Gyser was replaced to our suprised it was trapping the electricity. We had to switch it off because of that fault. We even phoned one of those who were fixing it .they promised to make follow up .We were hoping that we will get a call for arrangements but nothing. One guy said he will tell the other one.it seems as if they are sending us from one pillar to another .I make sure that money is there for contribution but service from standard is poor . No hot water for the whole family. We are using the kettle for the whole family this not good. It seems as if they are using cheap material to fix problems