You may be interested in how I've dealt with a company which made an incorrect delivery to me on Monday, and cited an 0871 number for its Customer Service desk.
First, I checked on saynoto0870, of course, and was able to lodge my complaint at minimum cost to myself.
Second, I phoned Ofcom, which confirmed that only an 03 or other geographic charge number should be offered; Ofcom suggested that I contact the company's local Trading Standards office in Powys.
This I did this morning, and they sympathetically connected me to the Consumer Helpline run by Citizens Advice. I was given a reference number by the Helpline and told that the matter would be referred back to Powys for action.
For your information, the company concerned was clifford-james of Brecon, whose website address I am not permitted to post at this time.
japitts wrote on Jun 21
st, 2014 at 9:06am:
What's the "correct" way of dealing with such companies? Complaints to their CS? Complain to their CEO? Or just report straight to Trading Standards?