Received a damaged handset after repairs

Around 11:00 on Wednesday 23-09-2015 my wife received a message from the neighbours, on her still BRAND NEW IPhone 4s-Then it was just out of 7 days. When trying to open the message she found that it won't unlock/power off. We could only get to Bethlehem on the Saturday to hand the phone back to the branch for repairs. The lady looked at the device and told my wife that it is still brand new. NO CRACKS nor SCRATCHES! They took the phone, noticed that the screen WAS NOT WORKING. Thereafter they advised me that it will go for software reloads on the following Monday. On Wednesday I received a message informing me that the device was ready to be collected. As we are form Reitz I could only get to Bethlehem again on Monday 05-10-2015. At the branch they advised me that NOTHING was wrong with my phone and I should pay R 57.00 for wasting their time, they also advised me the screen was CRACKED.AS SAID ABOVE, THE DEVICE WAS PERFECT WHEN IT WAS RECEIVED BY THEM EXCEPT FOR THE SOFTWARE PROBLEM! Basically they have damaged my device after I handed it in for repairs! I AM VERY UPSET AS THEY HAVE DAMAGED MY BRAND NEW DEVICE WHICH I SHOULD STILL PAY FOR, YET FOR 2 MORE YEARS!!!<br>