Poor service

I was called last year by a Vodacom consultant who said my contract was up for an upgrade. I was offered a few packages and I accepted a package that was offered with a Samsung device with a 32 gig on board memory. I questioned a few times of the onboard memory and was repeatedly told it had a 32 gig memory. I accepted the contract and awaited the delivery only to find it was a device with a 16 gig on board memory. I called and complained about them about what was offered and what I received was not what agreed on. I was transferred to many consultants only to be told told that it was a mistake on their part after listening to the voice recording. I then asked to replaced with the correct device only to be told that is not possible and I was to return the handset and then choose a more expensive package to receive the correct device. I told them I'm not willing to accept. I have the sealed device and now they have forwarded my account to a legal company for costs as I chose not to pay for something that was not agreed upon.