trouble adding my cell phone number for an agent to contact me

Hello BMS28,

Glad to know I can assist if this has resolved your issues please click "Mark as answer".

Best Regards.

Thank you so much! We got to the bottom of the problem, live agent was extremely helpful. The payments have been going to an old xbox 360 account that hasn’t been used in over two years! Problem masked by my son using gifted subscriptions that I didn’t
fully know of. They’ve issued 3 month refund as all they can do but i will follow this up tomorrow using the contact phone number I’ve been given. To me there’s a moral issue in taking money repeatedly for an account that is clearly inactive - it really wasn’t
clear we had to go into the account and remove the payment, we thought we’d sorted it when we set the new xbox one up. Its not easy! Thanks again.

Hello BMS28,

Here is the phone number.

1-800-My-Xbox

https://beta.support.xbox.com/contact-us

Click this link for more information. You can also tell virtual agent you'd like to speak to a live agent.

Best regards!

Hi there,

You'll want to give phone support a call so they can assist you with the account recovery. You can go

here for the number in your region,

In addition to what MadcowDisease said, I've copied this part from his sticky thread here: http://forums.xbox.com/xbox_forums/xbox_support/f/12/t/291276.aspx
My proofs are inaccessible!

If your Trusted PC isn't set (or is out-of-date), and your phone number and alternate email address are both out-of-date and/or inaccessible, then you'll have to go through the procedure to reset your account proofs. Bear in mind, if just one of your proofs
are outdated, you can delete it, confirm it with your valid proof, and add a new one easily, as per the steps in part 2. Here's how to reset your out-of-date proofs:

1. Go to remove all of your security info.
   
2. Click on Remove All.
3. Enter new accessible proofs, which will be added once the reset process has been completed.
   

When you chose to remove all of your security information, confirmations are sent to every phone and email on your account in-case you want to undo the process. The process to remove your inaccessible proofs can take from 30 days to 6 months, and the process
cannot be expedited by Xbox Support. If this time range is too long, an alternative would be to create a new account altogether, in which new and valid proofs can be entered immediately.