As others have mentioned, this company has exorbant and non-transparent charges.
In my case - the cost of labor and travel were as specified, however the cost of parts were more than double that of what I would have paid myself at a local hardware/plumbing shop. I was never informed of the parts prices until I received the invoice, some time after the work was completed. When confronted on this, Vosse were not willing to budge on the costs.
Work was carried out via a contractor of Vosse, who themselves responded from Werkspot.nl