Beware indeed.
In Qatar any insurance intermediary (for that is what deVere is) must be regulated either by the Qatar Central Bank or the Qatar Financial Centre Regulatory Authority.
If you get a call from deVere ask who are they regulated by, and please post the answer you get here.
They may say that they are licenced by some Ministry or other, but that's just the ordinary business licence that any bakery or dry cleaners will have - it will not permit them to sell or advise on insurance policies.
(Same applies to any "financial adviser" that contacts you in Doha.)