我在carphoewarehouse签的o2手机，我写信给o2，他们去回信，没有我的信息。是不是应该写信给carphoewarehouse？

If you simply wish to disconnect your mobile phone contract please contact them
by using the details I have provided below:

their Customer Loyalty team at: 0800 049 1100

their office opening hours are:

Monday - Friday: 8.00am - 8.00pm
Saturday: 9.00am - 6.00pm
Sunday & Bank Holidays: 10.00am - 5.00pm

Alternatively you may send in a written request into our Disconnections
Management team at the following address:

Disconnections Management
The Carphone Warehouse Limited
1 Portal Way
London
W3 6RS

hope it helps