being told the samsungJ5 prime is a dual sim when it is not

i was at Edgars Carnival mall on the 24th November and bought a Samsung J5 prime, I asked if it is a dual sim and the lady who assisted me said yes, and I was happy with that as it will put two sim cards than having to carry two phones, this phone doesn't take two sim cards, so why do your people say it does when it doesn't? are they getting a commission on sales? so they have to lie to customers so they can get a sale and get a commission? I want a dual sim phone so what must I do with this phone? I even went to buy another nano sim as my other phone uses a micro sim so I needed to do a sim swop and use my old no plus the sim and no that came with the phone..i just had no opportunity to come back to the shop as I was travelling, but the phone had defeated the purpose I have bought it for, just one sim and I still have to carry around more than one phone...please contact me asap or I will be calling consumer protection if I don't get a call by close of business the 4th December 2017...false advertising and lying to customers is a complete NO NO