Disgusting customers service

I've been waiting for builders warehouse Polokwane to assist with a faulty stove I purchased from them a couple of months back. They refused to change it for a new working stove and decided they will fix it. I had to wait for a so called technical to come tell me it needs a new part that he must order whilst I wait. He got the part three months later and the stove is in worst condition than before. Poor workmanship doesn't even begin the the condition this thing is in now.

What I don't understand is what's the 12 months guarantee for if they keep treating customers like this or I'm I an exception? If so I wonder why. Could it be my age or they are not fond of my complexion. Funny thing is that this was the first time I did business with them and I have learned never to go back in to that store again.

I'm taking to all media platforms to speak to anyone willing to listen and advise on steps to take to expose them.