Contract promotion not honoured

I recently signed up for Mychoice 150 on a summer promotion. The promo included a Hauwei p8 lite with a free bluetooth speaker at R230/pm x24 months.<br> <br> I signed up for this contract on the 28th November 2015 at the vodacom store in Port Alfred. I received the phone on the 3rd of December, however I did not receive the bluetooth speaker (as advertised on Vodacom's website) because I was told that the promotion was for November only. Surely your promotion should be honoured because the contract was signed in November and I only received the phone in December due to them not having stock of this particular cellphone at the time. <br>