BAD SERVICE

I bought a cellphone in August last year a few months later it gave me problem then I was given a new phone,a few months later the very same thing happened key pad malfunction.I took it back again and till this day I am still waiting as a good customer that I am I don't think I deserve this kind of treatment as my account is always up to date.The branch is always blaming Mtn of which is not fair on my side as I was never informed about them when I was purchasing the phone,i have never come across such bad service.