Sony Xperia device

July 30 2014 I signed a 24 month contract on a SONY Xperia device. The phone started giving me problems January 2015 (after 5months of usage). After being assessed by a FNB dot consultant it was said to me that it could need a software upgrade. It was arranged that my phoned be couriered to Joburg to have it checked out by designated SONY technicians. A few weeks later I was told that my bill is R4150 to be fixed as the phone was found to be water damaged and the LCD was cracked. This to me was false findings and not the condition I sent my phone. I am now without a phone for a month because I refuse to pay a cent to have the phone fixed. In the meantime I have been liasing with SONY and FNB consultants from different departments all to no avail. I was told to have the contract cancelled I must pay a penalty fee, which I am also unhappy to do. I feel this device is faulty and this is between FNB and SONY. I am a paying client and the service I have received is pathetic. It feels like I am now a ****.