Vodacom's Mistake now my own problem

I phoned Vodacom Randridge Mall to enquire about a handset before I upgraded, I asked if the device can take 2 sim cards and was told yes. I now have a device that CANNOT accommodated 2 sims, the employee at the store told me he did not say it took 2 sims. I requested the voice recordings from our conversation and spoke to the store manager - to date no-one has contacted me back yet, solved the problem or anything. They are refusing to help me!