Short changed

Hi, I ordered goods from Checkers (60sixty) 11 days ago. When I received my goods I asked for a till slip, which they supp**** electronically. I noticed that they over charged me buy R100. I contacted them and they say th bank woul correct the mistake within 2 to 10 days. I tried to communicate with them after that, but they just ignored me. I want to warn other customers not to make use of this delivery offer. I won't use them or any Checkers store again. Regards, Deon van Zyl