Ignores you when they owe you money

Checkers took my money for an item not delivered due to lack of stock, but then only PART refunded me for that item. I should rightfully receive a FULL refund since they did not have stock and charged me the full amount. They owe me money and all queries related to this go IGNORED for almost a week now. Last time I ordered with them years ago, their driver short-delivered two whole packets and I never got that money back. Don't shop with these people unless you like being cheated out of your hard-earned money.