Repair on a Phone

I handed my Sony Xperia z3 in for repairs on the 20th of January. They informed me that it would take 3 weeks to have it assessed and repaired. I phoned The Glen Vodacom branch they gave me a number to phone to get a status on my phone, I phoned they said they were still awaiting for the assessment to be done and would let me know. Well guess what they did not , I phoned again I was then given another number to phone as they had no information for me, once again I phoned the number and they said that they were awaiting for parts. On the 11th of February I got a call saying that to fix my phone I will have to pay. This took me by surprise as the Vodcaom store had informed me it would be covered by my warranty. Not wanting to waste more time as this is a business phone, I told them I will pay. The lady said that the phone would be ready on Friday the 13th February 2015. That did not happen either, this afternoon I get a call from Vodcom Fourways to find out if I had confirmed that I will pay because my phone has not been fixed yet. Can someone at Vodacom please get there staff trained and know what they doing. Do I pay or not and when will I get MY PHONE.