That's a little bit over the top. I've been overseas a lot and have had e-rewards complain, but it's never been permanent. I'm pretty sure it continued to complain even when back home, until I cleared all the e-rewards related cookies. No big deal.

As for the original issue, if e-rewards is getting your country wrong, maybe your ISP has received a new block of IP addresses that wasn't on the e-rewards database? I had that happen with one ISP many years ago and it caused random problems with various sites until all the geo-location databases eventually caught up. Check your IP address against various other web sites to see what they think. If it appears from that that e-rewards is wrong, I guess it would be necessary to contact them to fix it.