Misleading advertising

On the 7th of June round about 7:50am in the morning, I received an email advert. On this advert they advertised an electronic blanket for R299 and it stated that is is for single, double and queen. When I went to the store in Beacon Bay, I was told that the advert is an error and is incorrect, I told the guy who was assisting me that this is not my fault, and should rather take responsibility for the error and inform their marketing section to recall the email advert and fix the error. They sold me the queen electric blanket at R519 instead of R299. This is not right, it is misleading advertising, I left my house and travelled to the store only to pay a higher amount. Clicks where arrogant in their dealing and did not even show empathy with me.