Misled by the mondo sales person

I received a call from mondo three weeks ago and I was told about the tablet that comes with 2 gig for R69.00 a month and the second sim card with 50 minutes and both sim for R118.00 a month and I told the guy that I have already a contract for Wi-Fi but I think this will be a good deal for my daughter as she is using Wi-Fi at home for her home works .I even asked the guy to call me in the afternoon to explain the deal to my daughter, indeed he called. but he never explained to us that the 2 gig will be as follows: 500 MB to be used during the day and 1 gig & 500 MB to be used only mid night until 7 in the morning of which it will be useless to accept it. .The tablet was delivered on Friday 18 and I called for connection that was when I got that surprise . one sim is already in the tablet. ,and the answer I got from the lady over the phone was that Telkom will contact me soon as she said she has lodged my complain with telkom ,and up to now no one called me, I cant accept something we didn't agree on. She asked me what would I like them to do for me , I said I want 2 gig to be operative as agreed 24/7 not midnight stories.i still have the tablet and both sim with me.