Vodacom refuse to pay a repair, which is still under warranty

I've been a loyal customer for more than 10 year with multiple contract.(5 accounts) Never missed one premium. Renewed one of my contracts about 5 months ago. A week ago the phone stopped charging indefinitely . Tried several different chargers, nothing worked. I send the phone for repairs because it is still under 1 year warranty. Vodacom refused to cover the costs of repair. Vodacom said I must pay for the damage because of a very small crack on the screen(fyi the screen works 100%) my warranty is completely null and void. Vodacom if this is the way you treat your loyal customers, you have just lost a very good and loyal customer. Its complete nonsense. Shame on you Vodacom!!!!!!!!!!!!!!!