Bad service from Vodacom 4U Mall of Africa

I upgraded my contract received a new Iphone 7 on the 1 August. The store sold me the Panzer glass cover to protect glass from damage, cracks etc. The weekend of the 6 August i noticed a crack on the cover and took it back to the store. The phone has not fallen there is no damage on the phone. Went back to the store. The sevice level in this store is very low, the manager -Tanya Botha is not customer facing was reluctant to come out until i had to raise my voice for her to step out of the back room. My details were taken and promised to call they never did, i went back a week later and the store still has no stock. There is no urgency to find a solution. I called back and asked for a refund as i will get a replacement from another Vodacom store in MOA to which the consultant said i have to wait till Monday as no manager is in store. Staff is not customer focused, cannot manage complaints, cause frustration due to their lack of engagement, don't do as promised, overall a bad representation of the Vodacom brand. I want the value of the cover to be refunded as i di not trust this store