False advertising

Can someone from Checkers promotions please contact me. I was at checkers tonight and there was a special on the Ready Meals. A green sticker that said " Buy any 2 green sticker products and get the cheapest free." So I am an intellegent adult and I can read english. So I took 2 meals expecting the cheapest one for free. But NOO the trainee manager Jane Mokgolo seem te dissagree with me and made me pay for 2 to get a third free!!! But that is not what the sticker said so please explain to me!!!!