Participante anónimo 231 they have no right to "assume". They must check the written rules to determine whether you can or can't. You can always call a supervisor. There are some stupid employees at some airlines, some have even had the audacity to tell me that my country "doesn't exist", because they couldn't find in on the list 😂
Participante anónimo 736 Yes and no. Of course the IO can deny your entry, even if you have a valid visa, but as for the number of days, then can't just ignore the written rules: either reject their entry, or grant 180 days.
I use Cyberghost VPN and SecureLine VPN (that belongs to Avast, the antivirus company but can be bought as a standalone product). I don't use them out of privacy concerns, but rather for practical things (as content blocking by geolocation).