I uninstalled google play service updates and then tried to update it again but it doesn't work !

My mobile is Sony Xperia Z. I, for some reasons uninstalled google play service updates then tried to update it again but it says "can't install app". I even tried to manually install apks, but it keeps says " package not installed"

Cleaned google play store cach and data, restarted.
Cleared google play service cach and date, restarted but nothing worked.

What should i do now ?

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