Very Bad Service

Blackberry Z3- On the 19 Dec 2014 I bought a Blackberry Z 3 at Foschini Oudtshoorn.21 December 2014 I put my phone on charge through the night. The next morning on 22 Dec 2014 I took my phone off charge and saw that there was a crack in the screen and that the battery was very hot. When I bought the phone they told me that I could come back with the phone within the first 7 days of the transaction if any problems occur. On 23 Dec 2014 went back to the store but was told that they can't help me and it was my fault because there is no way that a screen would just crack but they will find out and get back to me. On 25 Dec 2014 went back to the store and was told they would send the phone away for repair. Two weeks later went back to the store and I was told that I have to pay the amount of R1100 so that they can repair the phone. At first I was angry but agreed later on to pay the amount. On 2 Apr 2015 4 months later they told me that that should pay in the money at ABSA and take the receipt to Foschini which I did. On 4 Apr 2015 I was told I would receive my phone 7 Days later. On 11 Apr 2015 still no phone. Today 15 April have not been contacted so still no phone.