You'll get an automated response saying they'll respond in 15 days.
After around 20 days the response will tell you that they cannot accept such detail by e-mail and you must phone or write.
My initial letter was registered and took 20 days to reach them. I tracked it and had a scan of the receiving signature. At first they denied receiving it until I provided evidence. I also reminded them that their procedures for 'track & trace' letters required them to add my letter with tracking number onto their system.
They wrote back (25 days later) asking for further information or to telephone them.
Hard to believe![]()