For queries on bookings made but not picked up yet you can call them within the UK on 0844 499 33 99. Internationally +44 (0) 844 499 33 99 (charges are applied for these numbers).
Alternatively please email reservations@sixt.com
For post booking queries you can call them within the UK on 01246 506220 Internationally +44 1246 506220 (charges are applied for these numbers).
Alternatively please use the following emails dependant on your pick up location:
customer-service-uk@sixt.com – UK Rentals
cs-international@sixt.com – International Rentals
An email form and booking log in systems are available on their website www.sixt.co.uk
Their postal address is:
Sixt rent a car
Head Office
Durrant House
47 Holywell Street
Chesterfield
Derbyshire
S41 7SJ