Are you talking about accessing the UK Play Store on your phone by using a VPN?
I've got Unotelly hard coded into my router for streaming at home and a Tunnel Bear account for my devices when I'm on the road, and I've not been able to access the UK Play Store using a VPN or whatever for about 3 years.
As I say, I bought this phone in Oman last week, it's got an Oman sim card and I access the internet using local wifi. The phone has never been near SA but because I've signed into my google account, the prices are shown in Rands and even uninstalling the Play Store then activating Tunnel Bear and reinstalling the Play Store while 'in the UK' still doesn't work. Hasn't done for a few years although it used to.
Something is wrong with your phone or geolocation service then. I've never had an issue with my Unotelly UK (or US) VPN on my phone. If I open the Play Store with the VPN active (in the router settings) I get the UK landing page.