I think even though you’ve had the tyres fitted, you should make both THQ and Navis aware that you’re really not happy with the quality! Put it back to them and see what response you get…. it won’t be good PR for either company if they don’t offer to do something?It really is a shame about the quality. I previously had a set of smoothies on my t4 from extreme offset wheels and the finish on them were perfect and they are less than half the price. Only reason I didn’t buy from them is because I wanted 19” and they only do 18 and 20 and only in black or white. In hindsight I should have got the 20” had them powder coated in silver , used the tyres I have on the van now and saved myself about £800-£1000
Hope you can get a positive result from this Dude!