Xapo is one of the biggest players in the space. There is no way they scammed you. You must have done something wrong.
End of story.
Don't say that you about this that you really know the smell of this service, are you reading with those complaints before and after what had happen to their accounts in that one lf the biggest player in the space?
Any person who have lost access to their xapo they have to contact to them through their support ticket and I am sure that you will get a reply from them within 24 or 48 hours and if they will not be able to provide you their service then they will send all of your bitcoins to you to one of your other wallet.
And you also, are you reading the whole thread and those who are comllaining? replying about 24-48 hours?then what happen?
Well in the very first place the question is who's fault? You're realizing that xapo is very trusted site this days after seing this lots of complaining of their service.
And most provably its their users fault why they are using this service and ver first place that they know that they're cannot access their private keys which is very risky as a bitcoin holder even just a small amount because you save it and you worked it then after that you lost it all for nothing.