What is your service provider? if it isnt the original for the Xperia Play, certain providers will allow you to activate it. If it is a verizon phone (verizon usually locks their phones to only be activated with it), you will have to unlock it and have the sim card for the phone. Then activate the phone temporairily by swapping it saying there is a problem with your current phone and that phone is the only other phone you have, and you need it activated, after this if activated, then upgrade to the google play. There is another way to fix your problem, it all depends on the model. Remove the battery cover and battery, and look for the model code, or go to settings>about phone and scroll down. The two models are the R800x and R800i. This only works with the R800x, but you have to uninstall the current os, android 2.3, and install android 6.0. If this doesn't work either, then you probrably need a new phone. If you get a new Xperia play, get th R800i model as it has android 4.0 and I don't think android 4.0 has Play Store, not Android store.
