on 18-08-2014 12:43
Contact details are here http://www.o2.co.uk/contactus
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 18-08-2014 14:30
Certain dates aren't possible for direct debits but customer service will be able to go through your options and select the best one to suit your needs.