Step 1: First your going to need a paypal account on your xbox live account.(Make sure you have no money on your account for obvious reasons)

Step 2: Go to MyTeam and purchace the highest costing player available.

Step 3: It will prompt you to buy VC so, your going to want to select 10,000Vc to purchace and confirm purchace using your paypal account.

Step 4: Select confirm purchace which should give you an error message.(Do this step twice. Make sure you get the error message only 2 times)

Step 5: Sign out of your account

Step 6: Sign into your account at press start screen

Step 7: Go to my team game mode and it should give you a message saying "resolving a prior failed transaction..." if you get this message you have successfully done the glitch

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Here is a video