Vodacom has the Worst customer service!!

I've just been told by an *********** supervisor @Vodacom that I must pay for a phone they could not repair!! 2days ago I took my blackberry 9720 in for repairs (for the 2nd time in one & half years), it was continuously rebooting by itself and had stopped charging. The salesperson told me they've discontinued this phone & that they may not be able to fix it, that I could take it to the \Pakistanis\" to have it fixed, or Vodacom would replace it with another phone to the value of R1200-R1300. She made me sign that I was aware there might be a R57 charge. I voiced my dissatisfaction about having to pay, she said she would put it on the system that I wasn't happy about paying for something that's not my fault.The very same day I get a voicemail that I must collect the phone. Today to my surprise, I'm told the phone is permanently irreparable!! That I must take their defective phone!! & and on top that still pay.. This phone was bought on 29July2014, I still have the receipt to prove it!! Vodacom you need to fix this or else I'm taking it up with my lawyer."