Gateway Fails to Deliver

I took my iPhone 5s for repairs on 21 October for a screen replacement. Arrived to collect on 24 October to collect just to find that the screen doesn’t work. An hour later they got it working however upon closer inspection found the phone still faulty. Returned on 28 October and to date the phone is still not working and they now have it in Cape Town, no feedback. No customer service at all. #BlackFriday