online pricing argument

on the 2nd of July 2015 i ordered 180 bottle of wine online, which came to the total payment is R588. the actual unit price is R50.00 per bottle, but Makro online gave me R8421.00 discount on this order, i have printed ordering sheets to prove they gave me huge discount. until 18th of July 2015, the online manager Jacob called me, he said system made mistake so they can't do anything and they can't give me the wine which i ordered.i told them i need legal advise, on the 20th july 2015, they just cancelled my orders and told me they will refund my money , until today i haven't received anything yet. i have no issues with taking this matter further, should i not receive the relevant responses.