I recently wanted to replace my Aston Martin with another newer one. Imaging my disgust when I found that a number of Aston Martin main dealers will only permit telephone contact by 0870 numbers and frequently either fail to reply to emails sent to their email addresses (which are rarely disclosed anyway ). They also generally fail to return calls even when one does use their 0870 number ( this necessitating, of course, further calls being made to them ).  Not only that, but I frequently found that cars that were seemingly bargains ( by this I mean that they are substantially below market price )had "long since been sold" but not removed from their websites - thereby being a lure to generate 0870 calls to them.  When I complained to Aston Martin themselves, they stated that the use of 0870 numbers provided their dealers with a good marketing tool to ascertain who actually wishes to buy their cars.
How this works is anybodie's guess, but I forcibly made the point that if the dealers want marketing tools they should not financially penalise potential customers, but should fund the marketing themselves.