Vodacom refused my refund

I asked for a fast charger at Vodacom Festival Mall. They gave me some R100 ****py quality cable, then I took it back and paid more, R250, for a seemingly better cable. That one too wasn't a fast charger so I took it back for a refund. They plainly refused and told me to come back with a lawyer. I'm never, ever in my life walking into another Vodacom shop. I'm also going to change my kids sim cards because I won't pay money to people who treat me like that.