It shouldn't be too difficult for them - The T&C's are quite clear:
O2 Refresh
1.8 If you’re an O2 Refresh customer you will get a Pay Monthly tariff that combines a 24-month Airtime Plan on a Pay Monthly Mobile Agreement and one or more Device Plans that allow you to pay for your equipment either upfront (the Cash Price) or by paying monthly instalments on a Consumer Credit Agreement, under the Consumer Credit Act 1974. Selected combinations of Device Plans and Airtime Plans with selected devices/bundles will include an up-front payment.
1.9 When an O2 Refresh Device Plan is paid off (after 24 months or earlier if you choose to pay it off at any time before the end of the 24 month term) or by paying the full cash price upfront, you can either:
Continue with your original Airtime Plan. In these circumstances, the combined Pay Monthly tariff will automatically reduce to reflect just the Airtime Plan tariff, until it is terminated in accordance with our Pay Monthly Mobile Agreement; or
Take a new O2 Refresh deal. Where a Device Plan has been paid off before the end of the 24 month term, we’ll waive the remaining months of your linked Airtime Plan that you haven’t used. For the avoidance of doubt, Charges (including for Additional Services) not included in your monthly Airtime Plan, or Charges arising prior to full repayment of the balance of a Device Plan, will not be waived and will be billed as normal. You will not be entitled to a refund of Charges already paid when paying off a Device Plan; or
Terminate your Airtime Plan. In these circumstances, your Airtime Plan will not be treated as having any remaining Minimum Period for the purposes of paragraph 8.3 of the Pay Monthly Mobile Agreement and you will be free to upgrade at a later date.
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