They are actually third party and it appears the communication between them and the actual rental companies does not exist.
We received a voucher from carflexi for our rental in our native language, which the rental company could not read and they either couldn't determine from the voucher or pretended not to be able to determine if we purchased an excess waiver insurance.
Carflexi did charge a certain amount in advance but it was not stated clearly on the voucher that it refers to this excess waiver insurance!
Due to this, we almost fell in a sale's trap to pay an extra substantial amount of money at the counter for an insurance we had already paid.
There was no one to approach at the time of rental regarding this.
It had cost us time and a lot of frustration!
So we will not use this company again.