Very poor and unprofessional communication.
Sterke punten
the monteur did a very professional work
Zwakke punten/verbeteringen
Poor communication. Make sure you get the price of the service confirmed in writing from this supplier. I have agreed upon and communicated with one price, and ended up paying 10% higher one. The explanation was that the price changed meanwhile and is not yet reflected on the website. Unacceptable behaviour towards customers.