Sandles got damaged within 3 hours of wearing them

I bought sandles at ackermans soshanguve crossing, I wear sandles for 3 hours and it was damaged into 2 pieces I didn't even walk much distance bt it was damaged as if I've been owning those sandles for 2 years, am very disappointed and I expect my problem to be resolved as soon as possible, I can't b buying something and wear it for 3 hours never, I was very embarrassed and disappointed, I had to get something to wear, No this is wrong