Bills and accounts / Paying your bill

1. Can I pay online without a payment slip or my 13 digit payment reference number to hand?
2. How can I increase or change my Direct Debit payments?
3. How can I change my bank account details?
4. How can I change my Direct Debit details?
5. How is my monthly Direct Debit payment calculated?
6. Why have you increased my Direct Debit even though I am in credit?
7. What payment methods are available to eBilling customers?
8. How can I set up a Direct Debit?
9. How can I pay my bill?
10. How can I find out how much my monthly payments will be?
11. How can I change the bank you collect my Direct Debit from?
12. Can I pay my bill online?
13. Can I pay my bill by phone?
14. Can I pay my bill by Direct Debit?
15. Can I pay my bill by credit or debit card?
16. Can I pay my bill at the Post Office?
17. Can I pay my bill at my bank?
18. Can I pay my bill at a PayZone?
19. Can I change the date of my Direct Debit payments?
20. Can I cancel my Direct Debit?