Angry 😡 customer.

I'm a truly disappointed customer, there was a savannah juniper promotion going for R249.99 for 24 500mls. So when I get to the store only 12 scans for that promotional price, now I've been sent from Piller to post just to get what is owed to me. They are telling me I can only get 12 and not the 24 showing online because it was an "error". The lady by the name of *****bo can't even help me to get the area managers number. They refuse to even call head office about the matter, the store manager also fails to assist.