Checkers lies to their clients

Checkers has had a Whiskas Cat food special about 4 times. Buy 2 x 2kg dry cat food and get a box of the wet food for free. I have bought this special 4 times in the past from Checkers, Waterfall Corner. Yesterday I go to MOA to get the special and get told it is actually buy 1 x 1kg dry cat food and get the wet food free, which I know is a lie. The website clearly shows a picture of 2 x 2kg dry foods AS WELL AS the description underneath that says: Buy 2 x 2kg Whiskas Dry Cat Food and receive the wet food for free. Customer Care tells me I am wrong and blatantly refused to honour the add as per their website and did not bother to apologise. Extremely bad service from Checkers and I am sorry, but you will not see me again. You lie to your clients and that is unacceptable.