I am not a CAB adviser - until they get back to you this is what I would advise you do
1 - write a 'diary' of what happened when - date contract taken out; date transferred to ex boyfriend's name etc. Back this up with as much evidence as you can; bank account details; direct debit payments made - from where, for how much etc.
2 - gather as much paperwork - e mail copies; transcripts of calls etc.
3 - DO NOT PHONE anyone. DO NOT let them phone you - tell them to put everything in writing.
If no-one from CAB gets in touch WRITE to Orange with a CC to the debt relief agency. DENY responsibility for any debt accrued since the date of the account transferring to the ex BF.
Dear orange
re phone number (number) account number (number)
On (date) the above numbered account and telephone was transferred to (name of ex). I therefore DO NOT ACCEPT ANY LIABILITY for any outstanding charges on the above-detailed account. Moreover I hereby request that you cease any and all attempts to bill me for these debts.
I request that you confirm, in writing, within 28 days of the date of this letter that I have no liability for the above debt.
Yours faithfully
(you)
RETAIN copies
PS I don't really work for a mobile provider either