Motorola / Motorizr Z3 Mobile — internal damage.

In moisture or rainy season it usually go on hanging always, this is regular problem before warrenty period gone end. now it was over the warrenty period (1 year & 5 month). now some time it's keypaid works automatically. after the one paid service they told me that it's internal PCB has been damaged, and it will cost more than the cost of that MOTORIZR Z3 mobile phone. I have perchased this mobile from Milan Infocom, indore (MP).in 13000 Rs/-. please help me butter sollution for this problem.
thank you