Complaint

I bought a Lenovo tablet on contract. I bought it with a view that I can make calls with it. To my disappointment the sim slot on the tablet was just a decoration. I tried to download apps but still I was not able to. I took the phone back to the store in July and the technician said he downloaded apps but I could not use the app. I took this phone to Somerset West where I was told that, Lenovo is a laptop not a tablet a nd it only have Microsoft Windows not Microsoft mobile. I took the phone back to MTn promenade and they just tell me that there is nothing they can do for me. I will be paying a contract that I'm not able to use. Please help