I recently purchased a used VW Golf 1.5 and when I contacted the dealership (as they have to be the ones to use the software unlocks) I was quoted £200 for apps unlock and a FURTHER £380 for the voice unlock. So nearly £600 pounds for what, in all honesty, I consider a minor addition to use Android auto and limited voice commands. When I researched this I found that that there are on-line companies who will send you the appropriate usb stick to fully unlock your infotainment system. The cheapest I have seen was £100. I have had the car about five weeks now and I am still thinking it over because it is a great car as it is and in all honesty as it is a 2018 registration the tech inside is older anyway, for example it requires a 3G network and can't connect now that we have moved onto newer network standards. So sometimes it is best to accept that the cost/benefit sometimes is not worth it.