Bad attitude and billing

My tablet has ink all over the screen and it did not fall nor bump into something and it does not even have a crack on the screen none whatsoever. I called *** Netsurfer and i got EXTREMELY BAD SERVICE AND ATTITUDE. I was told the manager's name is Betty than it changed to Matthew. I spoke to Matthew and told me i need to R750. This tablet is still on warranty. They told me i damaged the tablet. How because it was in my bag all the time at home and a bag i do not use. They told me since i damaged it i lose my warranty. When i asked for the tablet to be brought back and not fixed, Matthew told me i need to pay R170 for courier. I said i will fetch it, he told me they dont have a walk in centre and they are in Cape Town. Bought the phone in Joburg and it gets fixed in Cape Town? The attitude he had in his voice.This is NOT ACCEPTABLE AT ALL. ARE THEY TELLING ME I WONT GET MY PHONE IF I DONT PAY THIS R170? WHY PAY R750 FOR REPAIRS WHEN I CAN JUST GET A NEW TAB FOR R999?. THIS IS UTTER ****. THE WARRANTY SAYS NOTHING ABOUT A DELIVERY FEE AND IT IS STILL ON WARRANTY. I WANT MY TABLET REPAIRED AND THAT SO CALL MANAGER APPREHENDED. I WILL TAKE THIS FURTHER.NXA