Bad service

I bought a cellphone at WW Centurion in Dec 2015. It included a Vodacom promotion by receiving R300 worh of airtime when activating the new simcard. We did the simswop. The airtime was not allocated and I went back to the store. I was told by the lady at the cellphone counter that I should buy airtime before the R300 was allocated. I bought the R29 airtime but again nothing was allocated. On my way to holiday I have been trying to sort this out but with no success. Firstly I spoke to Promise and I was told that the Vodacom is is still on holiday and will only be back on 11 Jan 2016. I phoned again and spoke to Jabu. He said he would come back to be. Up to now I have not received anything. We bought this deal and we are entitled to the airtime.