Being ****** and no one can assist

I took out a new contract in April and spoke to a consultat who informed me vodacom is currently running a promotion and whether or not i took a router on top of the initial contract i was applying for online i wouldn't be billed extra . so ofcourse i agreed to take the device since i would not be paying extra for it..

To my surprise come end of the month i am actually getting charge for the handset and a contract cover which i knew nothing about has also been added onto my contract.

I have contacted vodacom several times requesting they listen to the recording now suddenly no one is able to assist me and i am being sent from pillar to post and being charged for someone else's error..