Cheap materials shoes less than week

I both shoes for my daughters for R179 x2. Within a week less than month those shoes they old creaking. Mean pep is selling cheap material. That not far on us customers. We prefer pep since we can not afford big shop. But are reaping us the last cents we have. I lost the slip but both the shoe at Pep Lenasia south next golden highway. That means I’m stack with cheap material shoes all I want is the exchange or refund