Game Stores Phalaborwa: terrible customer service

After having driven 3 hours to Game in Phalaborwa to buy an item, and then having had the manager there refuse to honour Game's promise to beat the price of a competitor, I complained on HelloPeter. Game contacted me and said they'd refund me the difference with a voucher. Then the item came on sale so they said they'd refund me a voucher for difference between the price I paid and the sale price. I have been waiting about 6 weeks, and have emailed Game dozens of times. The Phalaborwa Game employee once said he 'forgot' about the issue, hence the delay. This is extremely poor customer service, this matter should have been rectified weeks ago, with an apology, and it shouldn't be up to me to chase up Game every few days when I continue to not hear anything from them.