Entertainment bundle issue

I purchased an entertainment bundle for my home through the call centre and specifically told the consultant it was for netflix. The consultant failed to inform me that I needed to have a showmax account for the service to work and thus it deducted the streaming from my regular internet bundle, meaning that my data ran out and i had to purchase more. The consultant said i had to purchase showmax, but what about the data that was used and the cost that I had to pay because of their incompetence? I feel that they should refund the data that was used because the consultant didn't do their job and now I have an entertainment bundle that I cannot use unless I spend even more money on a showmax account.