Unfair request for payment of an already damaged phone

<p>I bought a Samsung J1 Ace for cash at the vodafone shop in Secunda Mall, Mpumalanga last year November. The phone has been giving me problems for months and has gone for repairs/checking more than 3 times. This time around the screen just went off and when i took it to my nearest branch, which is in Standerton, the guy told me that it was my fault and i would have to pay for the phone as i must have let it fall or hit it against something, the exact opposite! And i explained to him that ever since i bought that phone it's been giving me nothing but trouble and now that it has hit it's most down-low i'm now obligated to pay for them to fix my phone?? And worse, the phone is still under guarantee!!!! He called me a few days later with the amount i need to pay (about R1300) and i told him i willl do no such thing and asked for the repair centre contact details, and he gave me the Nelspruit numbers. I have been trying and trying to call those people, NOBODY picks up. I'm escalating this matter and showing my frustration by coming on here and hope somebody will at least assist. I am not happy with this poor service at all!! How frustrating and time consuming!!!</p>