Pathetic services

On the 5/06/15 my blackberry was not reading my sim so I took the phone on the 6/06/15 to the Vodashop Trade Route Mall. The consultant booked the phone in under job number ***5. There was no physical damage to this phone when it was booked in on the 11/06/15 I received a sms that the phone is ready for collection, on the 16/06/15 I went to collect the phone just to be told the phone is beyond repairs as the sim reader pins are broken(which was not broken when booking it in) as liquid damage which was also not like that when booking it in. How can a phone that was working all of the sudden be beyond repairs? I am very disappointed in the service from Vodacom as from the time we renewed this contract in December 14 have I been having problems between having buttons not working to getting a refurbished phone that was not reading the sim to now a phone that all of the sudden doesn't want to read the sim card and then been told the phone is beyond repairs is really not on. so I am now paying for a contract that I can't even use.