sony ericcson w910 saliva damage and wont charge?

my phone itself works fine. but problem is that it has stopped charging. if u put in a charged battery it works fine but wont charge it. though the charging terminals were damaged and took it to be repaired. the repair shop owner had a look and said he cant fix it coz there is too much corrosion inside. but then why does the phone at all? any way to fix it so that it can charge? have just still got bout 9 months left on m 2 yr plan. and the saliva damage is thanks to my little baby who had drooled all over it.