Non existent product

My fiance was called by a sales representative selling her a product by Mondo on behalf of telkom , I had answered the to get more info as my fiance was called earlier , we were told not once but numerous times as we wanted to be sure that we would receive 11gbs of data p/m and another card for telkom calls , when we received the package and called Mondo to activate the card I was told by call centre agent that we would only receive 1gbs of data p/m , we had entered into an agreement with your sales representative in good faith and will not be held liable for incompetence, I trust this will be sorted quickly and efficiently