This advice applies to Scotland:
Advice can vary depending on where you live.
Advice for other parts of the UK:
Use this letter to complain to a phone company that hasn't given you the cashback they promised.
Contact the Citizens Advice consumer helpline on 03454 04 05 06 if you need more help - a trained adviser can give you advice over the phone. You can also use an online form.
If you’re in Northern Ireland, contact Consumerline.