Vodacom data cancellation

So last week a salesperson from Vodacom sold me this 2 GB data package, which in my understanding would've been part of my existing cellphone nr, he even suggested i cancel my recurring 1 GB data bundle on my number. As an 'added benefit', they would be sending me a tablet with a sim card. Only to find out that the data is not on my existing number but a separate number and i would have to carry this tablet thing (not even a router) around with my all the time to use the data. This is not what the guy sold me! You can come collect this tablet thing and i want to cancel this contract with immediate effect as I have no use for it.