ADH warranty on Samsung S4

I took my Samsung S4 in for the screen to be repaired under the ADH warranty. It was registered for ADH and still within the warranty period. It was taken to the service centre that Samsung told me to go to in Vereeniging who told me it should take a week or 2 to repair. After 3 weeks of waiting and being told various stories and untruths by the service centre, I eventually fetched the unrepaired phone as I couldn't go without a phone for such a long period. I was promised that the spares have been ordered from Samsung and I will be contacted as soon as they arrive and can then just bring the phone in for repairs. It is now two months later and I am still having no joy with this \Samsung approved"service centre and have resorted to complain to Samsung. """