Disgusted to be part of Cell C

My wife's Samsung S3 Cell phone was given to her in January 2014. the phone have problems in August 2014. Whereby parts was replaced by the repair centre. The fone gave me issues in April 2015. It went back to repairs. They replaced more parts and did upgrades. 4 months after that the fone have issues again. It went to the repair centre who now claim the fone has liquid damage/corrosion meaning it is beyond repair. This after they opened the phone, they replaced parts even electrical parts on the fone. Surely if there was any sign of corrosion etc it shouldve been seen by the technicians. I dono the condition of the parts they fitted neither do I know the quality of the parts. To top it off that fone gave problems since day one it went in several times surely it is a poor quality product. After the last repairs the phone was laying at the regional centre for almost a month. No one bothering to contact us to advise the non repaired fone was there. I wrote several emails the response was the same as the receptionist send my query to the repair centre who obviously will give the same feedback. I requested the CEO' details and is still awaiting it after 3rd email.