Worst shop to buy from.

I bought a pair of flip flop in December 2017 from The Nu Shop in Vryburg Northwest. I returned the flip flop first week in January 2018. The flip flop is R399 a branded make but of very poor quality. I ended up getting another pair but diffrent color. Yet a week later returning it due to same issue. On returning it they promised within a week from the day I will get a better pair. It's been 1month and 2 weeks I'm still waiting for the flip flops. I asked to be refunded my money back so I can buy from another shop. But they refuse!!