Who are you trying to contact dd and are you sure the number is correct? The Hornby America contact details are here: https://www.hornby.com/us-en/contacts. I also found this number on a Google search: +1 253-922-7194. Don’t forget they are based on the west coast.
I would strongly suggest you speak to Professor Motor also - they have done very good business with you and should be able to organise a back-to-base fix, even if that is to the UK. I am sure the guys at Prof Motor talk to the Hornby America people regularly and to Slot.it in Italy.
You could also contact the Scalextric UK technical dept on +44 1843 233525 - open Monday to Thursday 9-5 (GMT) and Friday 9-3 (GMT). You could refer them to this thread and ask for their advice on how to proceed.
I hope that helps.