Misleading advertising

I have just a Wolf Lawnmower at Game Water crest in Waterfall. When I opened the box, there was no extension cord in the box. I phoned the store and spoke to Sheldon who informed me that the lawnmower does not come with an extension cord. I asked to speak to the manger and was put through to Shami Alli. She insisted that the lawnmower does not come with an extension cord. I tried to tell her that it was misleading advertising but she said she would assist me by delivering an extension cord to my home today and collect the money. I asked her to come and collect the lawnmower and bring my money and she said that she cannot do that but can help me after Christmas which in essence would mean that the 7 day return policy would have lapsed. Nowhere on the shelf does it indicate that the lawnmower does not come with an extension cord and I feel that this is misleading advertising on the part of the store. Shami also told me that I was the first ever customer to complain about this. I cannot believe it!! Sheldon told me to take it up with the manufacturer and not the store. Customer service sucks at Game stores and in most part is non existent. Please beware. I plan to return the lawnmower and will not shop at Game stores any longer.