Purchases don’t stay – Mexico City Travel Guide & Map Review

I bought a full version of this app, really enjoy it, but the problem is that the full version disappears all the time! Most of the time I can’t access the paid version, it says I am using the free version. When I press “already bought the upgrade?” The screen appears that all the purchases have been restored, but nothing happens. I’ve emailed the support couple weeks ago, but no response.
Review by Pricelessca on Mexico City Travel Guide & Map.