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Hi there and welcome to Just Answer, my name is Richard and I look forward to helping you.
I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
You cannot change countries sorry, but you can keep using the account in the other country and you can add another account on the PS4 as well and use this for any local purchases you wish to make moving forward.
You create a new PSN account here
then sign in on that account on the PS4