Control account work on behalf of DHL as a debt collector.I had an invoice from DHL for £996.23 for the importation of two mobility tricycles including a levy for £361:23 which I did not understand what it was for.I thought it was an import tax but a mobility scooter is zero import tax so I thought I would query it with DHL.So I sent them an e mail and they said not to pay it while they looked into it.Nothing happened then until I got a demanding letter from DHL so in receipt of that I paid the difference between the £996 and the £361 expecting them to come back and ask why,so I got my original question/Query answered.DHL drew the money from my bank on the 17th April and I then received the debt collectors Controlaccount) demand on the 26th April for the full amount plus debt charges.I then sent a recorded letter (I have signatures for acceptance) to both DHL and Controlaccount outlining my invoice query and asking for an explanation.I have never received a reply to either letter just another demand from Control account for the balance now owing plus charges.I have tried to talk to controlaccount by e mail but this is impossible as they only want phone calls so you have no record of what transpires.I sent an e mail via their own website asking them to e mail me as I wanted a record and they replied thanking me for asking for a statement of what I owed.I think I have the right to query an invoice (After 45 years in business) if I want to and should have a reply so I can then agree to pay or dispute same. My wife has paid the amount behind my back to get rid of it as I was prepared to go to court with my paperwork,showing that nobody could be bothered to talk to me about an invoice query,just ignore any reasonable request and hound me into the ground. DHL and controlaccount in my own opinion are acting as dictators and bulldozing customers around.I am surprised that DHL want to get a bad reputation acting this way and using debt collectors that you cannot send an e mail to.Shame on you both.