Multiple addresses not found while we use for correct address

We use API to get the correct address based on postal code and housenumber. Daily we plan trips for around 100 addresses and in 7% of the addresses we get other address back from RouteXL. I mailed RouteXL 3 weeks ago but no response. Hope you all can help me.

Locating partial addresses on the map can be a hassle. There are some tips to improve geocoding in our Wiki:

If you have geocoded addresses with another API, you may consider entering the lat,lng coordinates directly instead of the address.