Sony India — internal memory problem

Address:

Nainital, Uttarakhand

I have a problem with internal storage since the date I bought xperia c last two month only updated the preinstalled apps and it started showing me low internal storage leaving no space for installing any more apps. does this phone was designed only for making calls? i paid Rs 18000 its not worth on box it is given 4gb internal space . pls solve the problem i have request solution on customer site also but din't get any solution.. my email id [protected]@gmail.com