Faulty Gas stove

I bought a Defy gas stove at Ok Greytown Branch and only 2 cookers that are working.I phoned the shop more than ten times now reporting that the stove is faulty and they said they will report it to Defy(manufacturer).The 1st ref no *** they said they are not going to help me because the store didn't informed me to get an professional installer to come and connect the gas pipe on the stove for me.I phoned and inform the store that Defy refused to help and they said they is no such thing and they will do a follow up. I received 2nd reference *** they only called once to ask where I stay and where did I bought the stove after that I never here from them.I kept on phoning the shop but nothing happened until today where I decided to send my Mother to Greytown and they told her that If Defy come we have to pay for their labour. How can you pay for something that was faulty from the 1st day we started using it.The 3rd reference I received today *** can you please help maybe my problem will be solved if you intervene